Acererak the Archlich

When Acererak enters, if you haven't completed Tomb of Annihilation, return Acererak to its owner's hand and venture into the dungeon.
Whenever Acererak attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature of their choice.

Acquired Mutation

Enchant creature
Enchanted creature gets +2/+2 and is goaded. (It attacks each combat if able and attacks a player other than you if able.)
Whenever enchanted creature attacks, defending player gets two rad counters.

Dusk Imp

Dynaheir, Invoker Adept

Haste
You may activate abilities of other creatures you control as though those creatures had haste.
{T}: When you next activate an ability that isn't a mana ability this turn by spending four or more mana to activate it, copy that ability. You may choose new targets for the copy.

Dwarven Soldier

Whenever this creature blocks or becomes blocked by one or more Orcs, this creature gets +0/+2 until end of turn.

Drudge Skeletons

{B}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Dromosaur

Whenever this creature blocks or becomes blocked, it gets +2/-2 until end of turn.

About Face

Switch target creature's power and toughness until end of turn.

Acridian

Echo {1}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Abdel Adrian, Gorion's Ward

When Abdel Adrian enters, exile any number of other nonland permanents you control until Abdel Adrian leaves the battlefield. Create a 1/1 white Soldier creature token for each permanent exiled this way.
Choose a Background (You can have a Background as a second commander.)

+2 Mace

Equipped creature gets +2/+2.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

Acrobatic Cheerleader

Survival — At the beginning of your second main phase, if this creature is tapped, put a flying counter on it. This ability triggers only once.

Dire Wolf Prowler

{1}{G}: This creature gets +2/+2 and gains haste until end of turn. Activate only once each turn.

Dwarven Trader

Dwarven Recruiter

When this creature enters, search your library for any number of Dwarf cards, reveal them, then shuffle and put those cards on top in any order.

Cursed Monstrosity

Flying
Whenever this creature becomes the target of a spell or ability, sacrifice it unless you discard a land card.

Darting Merfolk

{U}: Return this creature to its owner's hand.

Abbot of the Sacred Meeple

Sinecure (This creature can occupy a space two spaces higher on the Monk Track than its power.)
Once on each of your odd-numbered (beige) production phases, you may spend two additional sheep when constructing a building. If you do, you may activate the lesser production ability of any building of prestige 5 or lower you control. Exceptions: Apiary, Cobbler (but not Shoemaker), Wainwright.

Abbey Matron

{W}, {T}: This creature gets +0/+3 until end of turn.

Acceptable Losses

As an additional cost to cast this spell, discard a card at random.
Acceptable Losses deals 5 damage to target creature.