Reach, trample

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters the battlefield, create that many tokens that are copies of it.)

Arco-Flagellant can't block.

Endurant — Pay 3 life: Arco-Flagellant gains indestructible until end of turn.

Flying

Arctic Aven gets +1/+1 as long as you control a Plains.

: Arctic Aven gains lifelink until end of turn. (Damage dealt by this creature also causes you to gain that much life.)

Kicker—Return a creature you control to its owner's hand. <I>(You may return a creature you control to its owner's hand in addition to any other costs as you cast this spell.)</I>

If Arctic Merfolk was kicked, it enters the battlefield with a +1/+1 counter on it.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

When Arctic Wolves enters the battlefield, draw a card.

, : Target creature gains vigilance until end of turn. Activate only during combat and only if defending player controls a snow land.

, : Choose target non-Wall creature the active player has controlled continuously since the beginning of the turn. That player may pay , where X is that mana value. If they don't pay, the creature attacks this turn if able, and at the beginning of the next end step, destroy it if it didn't attack this turn. Activate only before attackers are declared.

At the beginning of combat on your turn, you may attach any number of Auras and Equipment you control to target permanent or player.

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

When Ardent Electromancer enters the battlefield, add for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)

Vigilance

Metalcraft — Ardent Recruit gets +2/+2 as long as you control three or more artifacts.

Create a 2/2 white Knight creature token with vigilance. (Then exile this card. You may cast the enchantment later from exile.)

Flying

, : Tap target creature you control and target creature of an opponent's choice they control. Those creatures fight each other. (Each deals damage equal to its power to the other.)

Legendary creatures don't untap during their controllers' untap steps.

When Arena of the Ancients enters the battlefield, tap all legendary creatures.

Whenever you cast your first spell during each opponent's turn, put a +1/+1 counter on Arena Trickster.

Target permanent becomes an artifact in addition to its other types until end of turn.

Draw a card.

Equipped creature gets +6/+6.

Whenever equipped creature attacks, destroy target permanent.

Equip

, : Return target artifact card from your graveyard to your hand.

Enlist (As this creature attacks, you may tap a nonattacking creature you control without summoning sickness. When you do, add its power to this creature's until end of turn.)

When Argivian Cavalier enters the battlefield, create a 1/1 white Soldier creature token.

Argoth, Sanctum of Nature enters the battlefield tapped unless you control a legendary green creature.

: Add .

, : Create a 2/2 green Bear creature token, then mill three cards. Activate only as a sorcery.

(Melds with Titania, Voice of Gaea.)

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

Whenever you cast an enchantment spell, draw a card.

Argothian Sprite can't be blocked by artifact creatures.

: Put two +1/+1 counters on Argothian Sprite.

Prevent all damage that would be dealt to Argothian Treefolk by artifact sources.

When Aria of Flame enters the battlefield, each opponent gains 10 life.

Whenever you cast an instant or sorcery spell, put a verse counter on Aria of Flame, then it deals damage equal to the number of verse counters on it to target player or planeswalker.

Arisen Gorgon has deathtouch as long as you control a Liliana planeswalker. (Any amount of damage this deals to a creature is enough to destroy it.)

Flying

Whenever you cast a spell, put the cards in your hand on the bottom of your library in any order, then draw that many cards.

Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

+2: Add .

0: Until end of turn, Arlinn, the Moon's Fury becomes a 5/5 Werewolf creature with trample, indestructible, and haste.

Each creature you control that's a Wolf or a Werewolf enters the battlefield with an additional +1/+1 counter on it.

−2: Create a 2/2 green Wolf creature token.

Until end of turn, creatures you control gain "Whenever this creature deals damage to an opponent, you may return target creature that player controls to its owner's hand."

At the beginning of your upkeep, put a doom counter on Armageddon Clock.

At the beginning of your draw step, Armageddon Clock deals damage equal to the number of doom counters on it to each player.

: Remove a doom counter from Armageddon Clock. Any player may activate this ability but only during any upkeep step.

Other Kor creatures you control get +2/+2 for each Equipment attached to Armament Master.

Target creature gets +1/+1 and gains double strike until end of turn.

Fuse (You may cast one or both halves of this card from your hand.)

Armed Response deals damage to target attacking creature equal to the number of Equipment you control.

, , Sacrifice Armillary Sphere: Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.

Whenever Armix, Filigree Thrasher attacks, you may discard a card. When you do, target creature defending player controls gets -X/-X until end of turn, where X is the number of artifacts you control plus the number of artifact cards in your graveyard.

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

All Sliver creatures have ": This creature gets +0/+1 until end of turn."

Ward (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays .)

: Armored Armadillo gets +X/+0 until end of turn, where X is its toughness.

Flying, vigilance

When Armored Kincaller enters the battlefield, you may reveal a Dinosaur card from your hand. If you do or if you control another Dinosaur, you gain 3 life.

Armored Scrapgorger gets +3/+0 as long as it has three or more oil counters on it.

: Add one mana of any color.

Whenever Armored Scrapgorger becomes tapped, exile target card from a graveyard and put an oil counter on Armored Scrapgorger.

Flying

Whenever Armored Skyhunter attacks, look at the top six cards of your library. You may put an Aura or Equipment card from among them onto the battlefield. If an Equipment is put onto the battlefield this way, you may attach it to a creature you control. Put the rest of those cards on the bottom of your library in a random order.

Celebration — Armory Mice gets +0/+2 as long as two or more nonland permanents entered the battlefield under your control this turn.

, Sacrifice a Goblin: Arms Dealer deals 4 damage to target creature.

: You may put an artifact card from your hand onto the battlefield. That artifact gains haste. Sacrifice it at the beginning of the next end step.

Create thirteen tapped 2/2 black Zombie creature tokens.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

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.