Ali Baba

Creature — Human Rogue (1/1)

: Tap target Wall.

Alirios, Enraptured

Legendary Creature — Human (2/3)

Alirios, Enraptured enters the battlefield tapped.
Alirios doesn't untap during your untap step if you control a Reflection.
When Alirios enters the battlefield, create a 3/2 blue Reflection creature token.

All-Seeing Arbiter

Creature — Avatar (5/4)

Flying
Whenever All-Seeing Arbiter enters the battlefield or attacks, draw two cards, then discard a card.
Whenever you discard a card, target creature an opponent controls gets -X/-0 until your next turn, where X is the number of different mana values among cards in your graveyard.

Allosaurus Shepherd

Creature — Elf Shaman (1/1)

This spell can't be countered.
Green spells you control can't be countered.
: Until end of turn, each Elf creature you control has base power and toughness 5/5 and becomes a Dinosaur in addition to its other creature types.

Alloy Animist

Creature — Human Druid (1/1)

: Until end of turn, target noncreature artifact you control becomes a 4/4 artifact creature.

Alluring Siren

Creature — Siren (1/1)

: Target creature an opponent controls attacks you this turn if able.

Almighty Brushwagg

Creature — Brushwagg (1/1)

Trample
: Almighty Brushwagg gets +3/+3 until end of turn.

Alora, Merry Thief

Legendary Creature — Halfling Rogue (3/2)

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.)

Alrund, God of the Cosmos // Hakka, Whispering Raven

Legendary Creature — God // Legendary Creature — Bird (1/1)

Alrund gets +1/+1 for each card in your hand and each foretold card you own in exile.
At the beginning of your end step, choose a card type, then reveal the top two cards of your library. Put all cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.

Hakka, Whispering Raven

Flying
Whenever Hakka, Whispering Raven deals combat damage to a player, return it to its owner's hand, then scry 2.

Alseid of Life's Bounty

Enchantment Creature — Nymph (1/1)

Lifelink
, Sacrifice Alseid of Life's Bounty: Target creature or enchantment you control gains protection from the color of your choice until end of turn.

Ambassador Laquatus

Legendary Creature — Merfolk Wizard (1/3)

: Target player mills three cards.

Amoeboid Changeling

Creature — Shapeshifter (1/1)

Changeling (This card is every creature type.)
: Target creature gains all creature types until end of turn.
: Target creature loses all creature types until end of turn.

Amphin Cutthroat

Creature — Salamander Rogue (2/4)

Amphin Mutineer

Creature — Salamander Pirate (3/3)

When Amphin Mutineer enters the battlefield, exile up to one target non-Salamander creature. That creature's controller creates a 4/3 blue Salamander Warrior creature token.
Encore (, Exile this card from your graveyard: For each opponent, create a token copy that attacks that opponent this turn if able. They gain haste. Sacrifice them at the beginning of the next end step. Activate only as a sorcery.)

Amphin Pathmage

Creature — Salamander Wizard (3/2)

: Target creature can't be blocked this turn.

Amugaba

Creature — Illusion (6/6)

Flying
, Discard a card: Return Amugaba to its owner's hand.

Ana Disciple

Creature — Human Wizard (1/1)

, : Target creature gains flying until end of turn.
, : Target creature gets -2/-0 until end of turn.

Ancient Carp

Creature — Fish (2/5)

Ancient Crab

Creature — Crab (1/5)

Ancient Silver Dragon

Creature — Elder Dragon (8/8)

Flying
Whenever Ancient Silver Dragon deals combat damage to a player, roll a d20. Draw cards equal to the result. You have no maximum hand size for the rest of the game.