Mercurial Pretender

You may have Mercurial Pretender enter the battlefield as a copy of a creature you control, except it has “: Return this creature to its owner’s hand.”

Famine

Famine deals 3 damage to each creature and each player.

Brago, King Eternal

Flying
Whenever Brago, King Eternal deals combat damage to a player, exile any number of target nonland permanents you control, then return those cards to the battlefield under their owner’s control.

Brago, King Eternal

Flying
Whenever Brago, King Eternal deals combat damage to a player, exile any number of target nonland permanents you control, then return those cards to the battlefield under their owner’s control.

Brago’s Favor

Hidden agenda (Start the game with this conspiracy face down in the command zone and secretly choose a card name. You may turn this conspiracy face up any time and reveal that name.)
Spells with the chosen name you cast cost less to cast.

Custodi Soulbinders

Custodi Soulbinders enters the battlefield with X +1/+1 counters on it, where X is the number of other creatures on the battlefield.
, Remove a +1/+1 counter from Custodi Soulbinders: Create a 1/1 white Spirit creature token with flying.

Ashiok’s Adept

Heroic — Whenever you cast a spell that targets Ashiok’s Adept, each opponent discards a card.

Curse of Shallow Graves

Enchant player
Whenever a player attacks enchanted player with one or more creatures, that attacking player may create a tapped 2/2 black Zombie creature token.

Famine

Famine deals 3 damage to each creature and each player.

Daxos of Meletis

Daxos of Meletis can’t be blocked by creatures with power 3 or greater.
Whenever Daxos of Meletis deals combat damage to a player, exile the top card of that player’s library. You gain life equal to that card’s converted mana cost. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.

Ashiok, Nightmare Weaver

+2: Exile the top three cards of target opponent’s library.
−X: Put a creature card with converted mana cost X exiled with Ashiok, Nightmare Weaver onto the battlefield under your control. That creature is a Nightmare in addition to its other types.
−10: Exile all cards from all opponents’ hands and graveyards.

Teysa, Envoy of Ghosts

Vigilance, protection from creatures
Whenever a creature deals combat damage to you, destroy that creature. Create a 1/1 white and black Spirit creature token with flying.