Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Trample

Heavy Power Hammer — Whenever Aberrant deals combat damage to a player, destroy target artifact or enchantment that player controls.

When Acererak the Archlich enters the battlefield, if you haven't completed Tomb of Annihilation, return Acererak the Archlich to its owner's hand and venture into the dungeon.

Whenever Acererak the Archlich attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature.

Evolve (Whenever a creature enters the battlefield under your control, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

First strike

When Aether Chaser enters the battlefield, you get (two energy counters).

Whenever Aether Chaser attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

When Aether Herder enters the battlefield, you get (two energy counters).

Whenever Aether Herder attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

When Aether Poisoner enters the battlefield, you get (two energy counters).

Whenever Aether Poisoner attacks, you may pay . If you do, create a 1/1 colorless Servo artifact creature token.

Flying

Whenever Aetherstorm Roc or another creature enters the battlefield under your control, you get (an energy counter).

Whenever Aetherstorm Roc attacks, you may pay . If you do, put a +1/+1 counter on it and tap up to one target creature defending player controls.

Agent's Toolkit enters the battlefield with a +1/+1 counter, a flying counter, a deathtouch counter, and a shield counter on it. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Whenever a creature enters the battlefield under your control, you may move a counter from Agent's Toolkit onto that creature.

, Sacrifice Agent's Toolkit: Draw a card.

Whenever an enchantment enters the battlefield under your control, create a 2/2 white Cat creature token. If that enchantment is an Aura, you may attach it to the token.

Haste

Whenever Akoum Battlesinger or another Ally enters the battlefield under your control, you may have Ally creatures you control get +1/+0 until end of turn.

When Alharu, Solemn Ritualist enters the battlefield, put a +1/+1 counter on each of up to two other target creatures.

Whenever a nontoken creature you control with a +1/+1 counter on it dies, create a 1/1 white Spirit creature token with flying.

Partner (You can have two commanders if both have partner.)

When Alpine Houndmaster enters the battlefield, you may search your library for a card named Alpine Watchdog and/or a card named Igneous Cur, reveal them, put them into your hand, then shuffle.

Whenever Alpine Houndmaster attacks, it gets +X/+0 until end of turn, where X is the number of other attacking creatures.

Partner with Rory Williams (When this creature enters the battlefield, target player may put Rory into their hand from their library, then shuffle.)

Whenever Amy Pond deals combat damage to a player, choose a suspended card you own and remove that many time counters from it.

Doctor's companion (You can have two commanders if the other is the Doctor.)

Flying, lifelink

Whenever Angel of Unity enters the battlefield or you cast a party spell, choose a party creature card in your hand. It perpetually gets +1/+1. (A party card or spell is a Cleric, Rogue, Warrior, or Wizard.)

Flying, vigilance

Whenever Angelic Sell-Sword or another nontoken creature enters the battlefield under your control, create a 1/1 red Mercenary creature token with ": Target creature you control gets +1/+0 until end of turn. Activate only as a sorcery."

Whenever Angelic Sell-Sword attacks, if its power is 6 or greater, draw a card.

Menace

Other enchantment creatures you control have menace.

Whenever Anikthea enters the battlefield or attacks, exile up to one target non-Aura enchantment card from your graveyard. Create a token that's a copy of that card, except it's a 3/3 black Zombie creature in addition to its other types.

Whenever a creature enters the battlefield under your control, you gain 1 life. If Answered Prayers isn't a creature, it becomes a 3/3 Angel creature with flying in addition to its other types until end of turn.

Graft 2 (This creature enters the battlefield with two +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)

: Target creature with a +1/+1 counter on it gains reach until end of turn. (It can block creatures with flying.)

Vigilance, lifelink

When Aragorn, King of Gondor enters the battlefield, you become the monarch.

Whenever Aragorn attacks, up to one target creature can't block this turn. If you're the monarch, creatures can't block this turn.

When Arboreal Alliance enters the battlefield, create an X/X green Treefolk creature token.

Whenever you attack with one or more Elves, populate. (Create a token that's a copy of a creature token you control.)

Trample

Whenever another artifact enters the battlefield, put a +1/+1 counter on Arcbound Crusher.

Modular 1 (This creature enters the battlefield with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Menace

Modular 2 (This creature enters the battlefield with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Whenever you cast a spell other than your first spell each turn, put a +1/+1 counter on Arcbound Tracker.

Landfall — Whenever a land enters the battlefield under your control, you get (an energy counter).

Pay eight : Create a 6/6 colorless Beast artifact creature token.

Flying

Whenever Archon of Cruelty enters the battlefield or attacks, target opponent sacrifices a creature or planeswalker, discards a card, and loses 3 life. You draw a card and gain 3 life.

Flying, lifelink

Pegasus creatures you control have lifelink.

Constellation — Whenever an enchantment enters the battlefield under your control, create a 2/2 white Pegasus creature token with flying.

Haste

Whenever Ardoz, Cobbler of War or another creature enters the battlefield under your control, that creature gets +2/+0 until end of turn.

: Create a 1/1 red Goblin creature token with haste. Activate only as a sorcery.

Whenever a creature you control attacks or a creature enters the battlefield under your control attacking, you may pay . If you do, you may put a creature card with mana value less than that creature's mana value from your hand onto the battlefield tapped and attacking.

When Assimilation Aegis enters the battlefield, exile up to one target creature until Assimilation Aegis leaves the battlefield.

Whenever Assimilation Aegis becomes attached to a creature, for as long as Assimilation Aegis remains attached to it, that creature becomes a copy of a creature card exiled with Assimilation Aegis.

Equip

Whenever Astrid Peth enters the battlefield or attacks, create a Food token.

Brand-new Sky — Whenever you sacrifice a Clue or Food, Astrid Peth explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

Whenever a creature enters the battlefield under your control, you may destroy target artifact or enchantment.

Creatures your opponents control enter the battlefield tapped.

Whenever a creature enters the battlefield under an opponent's control, you gain 1 life.

Whenever Ayara, First of Locthwain or another black creature enters the battlefield under your control, each opponent loses 1 life and you gain 1 life.

, Sacrifice another black creature: Draw a card.

As B.O.B. enters the battlefield, create four 1/1 blue Beeble creature tokens.

The number of loyalty counters on B.O.B. is equal to the number of Beebles you control. (Create or sacrifice Beebles whenever B.O.B. gains or loses loyalty.)

+1: Up to X target Beebles can't be blocked this turn, where X is the number of cards in your hand.

−1: Draw a card.

When Barrowin of Clan Undurr enters the battlefield, venture into the dungeon. (Enter the first room or advance to the next room.)

Whenever Barrowin of Clan Undurr attacks, return up to one creature card with mana value 3 or less from your graveyard to the battlefield if you've completed a dungeon.

Vigilance, protection from multicolored

When Basri's Lieutenant enters the battlefield, put a +1/+1 counter on target creature you control.

Whenever Basri's Lieutenant or another creature you control dies, if it had a +1/+1 counter on it, create a 2/2 white Knight creature token with vigilance.

When Bat Colony enters the battlefield, create a 1/1 black Bat creature token with flying for each mana from a Cave spent to cast it.

Whenever a Cave enters the battlefield under your control, put a +1/+1 counter on target creature you control.

As Battle of Hoover Dam enters the battlefield, choose NCR or Legion.

• NCR — At the beginning of your end step, return target creature card with mana value 3 or less from your graveyard to the battlefield with a finality counter on it.

• Legion — Whenever a creature you control dies, put two +1/+1 counters on target creature you control.

Trample

Whenever another Dinosaur enters the battlefield under your control, you may have Belligerent Yearling's base power become equal to that creature's power until end of turn.

Enchant creature

When Bestial Fury enters the battlefield, draw a card at the beginning of the next turn's upkeep.

Whenever enchanted creature becomes blocked, it gets +4/+0 and gains trample until end of turn.

Whenever another Zombie enters the battlefield under your control, you may tap target artifact or creature.

Whenever an Angel enters the battlefield under your control, you gain 4 life.

Whenever an Angel you control dies, create a 1/1 white Spirit creature token with flying.

For Mirrodin (When this Equipment enters the battlefield, create a 2/2 red Rebel creature token, then attach this to it.)

Whenever Blade of Shared Souls becomes attached to a creature, for as long as Blade of Shared Souls remains attached to it, you may have that creature become a copy of another target creature you control.

Equip

, Sacrifice a creature: Blasting Station deals 1 damage to any target.

Whenever a creature enters the battlefield, you may untap Blasting Station.

Deathtouch

Whenever Blight Titan enters the battlefield or attacks, mill two cards, then incubate X, where X is the number of creature cards in your graveyard. (Create an Incubator token with X +1/+1 counters on it and ": Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.)

Whenever a creature enters the battlefield under an opponent's control, you may have that player lose 1 life.

Changeling (This card is every creature type.)

As Bloodline Pretender enters the battlefield, choose a creature type.

Whenever another creature of the chosen type enters the battlefield under your control, put a +1/+1 counter on Bloodline Pretender.

Flying

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

When Bloodwater Entity enters the battlefield, you may put target instant or sorcery card from your graveyard on top of your library.

When Blue Ribbon enters the battlefield, ask a person outside the game which creature you control is most deserving of a blue ribbon. Attach Blue Ribbon to that creature.

Equipped creature has best in show. (Whenever another creature becomes the target of a spell or ability you control, you may copy that spell or ability. If you do, the copy targets this creature.)

Equip

Champion a Goblin (When this enters the battlefield, sacrifice it unless you exile another Goblin you control. When this leaves the battlefield, that card returns to the battlefield.)

Whenever a Goblin you control deals combat damage to a player, you may create a 1/1 black Goblin Rogue creature token.

Flying

Whenever another creature enters the battlefield under your control, target creature gets +2/+0 until end of turn.