Aboshan's Desire

Enchant creature
Enchanted creature has flying.
Threshold — Enchanted creature has shroud as long as seven or more cards are in your graveyard. (It can't be the target of spells or abilities.)

Accelerate

Target creature gains haste until end of turn.
Draw a card.

Clam Session

As this creature enters, choose a word.
At the beginning of your upkeep, you may sing at least six words of a song, at least one of which is the chosen word. If you don't, sacrifice this creature. You can't repeat a song.

Alexander Clamilton

Whenever you cast a wordy spell, scry 2. (A spell is wordy if it has four or more lines of rules text.)
{1}{R}, {T}: Choose target creature you don't control. Reveal the top card of your library. Alexander Clamilton gets +X/+0 until end of turn, where X is the number of lines of rules text of the revealed card. Alexander Clamilton fights that creature.

Clam-I-Am

If you roll a 3 on a six-sided die, you may reroll that die.

Acidic Soil

Acidic Soil deals damage to each player equal to the number of lands they control.

Clambassadors

Whenever this creature deals damage to a player, choose an artifact, creature, or land you control. That player gains control of that permanent.

Academic Dispute

Target creature blocks this turn if able. You may have it gain reach until end of turn.
Learn. (You may reveal a Lesson card you own from outside the game and put it into your hand, or discard a card to draw a card.)