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.

Flying

At the beginning of your upkeep, mill a card. If an instant or sorcery card was milled this way, transform Aberrant Researcher.

Flying

When Abyssal Horror enters the battlefield, target player discards two cards.

Trample

Agent Frank Horrigan has indestructible as long as it attacked this turn.

Whenever Agent Frank Horrigan enters the battlefield or attacks, proliferate twice. (To proliferate, choose any number of permanents and/or players, then give each another counter of each kind already there.)

Flying

As Alhammarret, High Arbiter enters the battlefield, each opponent reveals their hand. You choose the name of a nonland card revealed this way.

Your opponents can't cast spells with the chosen name (as long as this creature is on the battlefield).

Whenever you attack, up to one target attacking creature can't be blocked this turn. Return that creature to its owner's hand at the beginning of the next end step.

Choose a Background (You can have a Background as a second commander.)

Ward—Pay 3 life.

Whenever you gain life, Amalia Benavides Aguirre explores. Then destroy all other creatures if its power is exactly 20. (To have this creature explore, 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.)

Look at the top five cards of your library. You may reveal a colorless card from among them and put it into your hand. Then put the rest on the bottom of your library in any order.

Flying

When Archfiend of Sorrows enters the battlefield, creatures your opponents control get -2/-2 until end of turn.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Return target creature to its owner's hand.

Addendum — If you cast this spell during your main phase, draw a card.

Whenever Arrogant Bloodlord blocks or becomes blocked by a creature with power 1 or less, destroy Arrogant Bloodlord at end of combat.

Whenever Arrogant Poet attacks, you may pay 2 life. If you do, it gains flying until end of turn.

Trample

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

If four or more creatures are attacking, you may pay rather than pay this spell's mana cost.

Arrow Volley Trap deals 5 damage divided as you choose among any number of target attacking creatures.

Destroy target artifact or enchantment. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Players can't cast spells from graveyards or activate abilities of cards in graveyards.

Whenever a creature dies, you gain 1 life.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)

Whenever this creature mutates, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield.

Destroy target creature that dealt damage this turn.

When Azorius Arrester enters the battlefield, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

B.F.M. onto the battlefield. If one B.F.M. card

more creatures.

(Transforms from Thousand Moons Smithy.)

: Add .

Whenever you cast an artifact or creature spell using mana produced by Barracks of the Thousand, create a white Gnome Soldier artifact creature token with "This creature's power and toughness are each equal to the number of artifacts and/or creatures you control."

, Sacrifice a creature: Barrage of Expendables deals 1 damage to any target.

Devoid (This card has no color.)

, Sacrifice another colorless creature: Barrage Tyrant deals damage equal to the sacrificed creature's power to any target.

Target creature gains trample until end of turn. When that creature becomes blocked this turn, it gets +1/+1 until end of turn for each creature blocking it.

Barren Moor enters the battlefield tapped.

: Add .

Cycling (, Discard this card: Draw a card.)

: Prevent the next 1 damage that would be dealt to any target this turn.

Put a -1/-1 counter on Barrenton Medic: Untap Barrenton Medic.

Exile up to three target enchantments.

Cycling (, Discard this card: Draw a card.)

, Sacrifice a permanent: Return target creature to its owner's hand.

At the beginning of your upkeep, you may put a page counter on Barrin's Codex.

, , Sacrifice Barrin's Codex: Draw X cards, where X is the number of page counters on Barrin's Codex.

Return target permanent to its owner's hand if that permanent shares a color with the most common color among all permanents or a color tied for most common.

At the beginning of your upkeep, sacrifice Barrow Ghoul unless you exile the top creature card of your graveyard.

When Barrow Witches enters the battlefield, return target Knight card from your graveyard to your hand.

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.

Boast — : Creatures you control get +1/+1 until end of turn. (Activate only if this creature attacked this turn and only once each turn.)

Target player takes an extra turn after this one. Shuffle Beacon of Tomorrows into its owner's library.

Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.)

Search your library for a card, exile it face down, then shuffle. If this spell was bargained, you may cast the exiled card without paying its mana cost if that spell's mana value is 4 or less. Put the exiled card into your hand if it wasn't cast this way.

Trample

Black Carriage doesn't untap during your untap step.

Sacrifice a creature: Untap Black Carriage. Activate only during your upkeep.

This spell can't be countered.

Shroud (This creature can't be the target of spells or abilities.)

Whenever a player casts a black spell, Bog Gnarr gets +2/+2 until end of turn.

When Boneyard Aberration dies, exile it. If you do, conjure three cards named Reassembling Skeleton into your graveyard.

Escalate (Pay this cost for each mode chosen beyond the first.)

Choose one or both —

• Creatures you control get +2/+0 until end of turn.

• Creatures you control get +0/+2 until end of turn.

Escalate (Pay this cost for each mode chosen beyond the first.)

Choose one or both —

• Target creature gets +1/+1 until end of turn.

• Target creature gets -1/-1 until end of turn.

Draw a card for each tapped creature target opponent controls.

Flash

Flying

Brazen Borrower can block only creatures with flying.

Flash

When Brinebarrow Intruder enters the battlefield, target creature an opponent controls gets -2/-0 until end of turn.

Flying

Reinforce 2— (, Discard this card: Put two +1/+1 counters on target creature.)

Whenever Burrenton Shield-Bearers attacks, target creature gets +0/+3 until end of turn.

Enchant creature

Enchanted creature has mountainwalk. (It can't be blocked as long as defending player controls a Mountain.)

, : Target player reveals X cards from their hand and you choose one of them. That player discards that card. Activate only as a sorcery.

Flying

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