Keening Banshee

Flying
When Keening Banshee enters, target creature gets -2/-2 until end of turn.

Polymorph

Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into their library.

Teferi's Curse

Enchant artifact or creature
Enchanted permanent has phasing. (It phases in or out before its controller untaps during each of their untap steps. While it's phased out, it's treated as though it doesn't exist.)

Reanimate

Put target creature card from a graveyard onto the battlefield under your control. You lose life equal to its mana value.

Ekundu Cyclops

If a creature you control attacks, Ekundu Cyclops also attacks if able.

Binding Agony

Enchant creature
Whenever enchanted creature is dealt damage, Binding Agony deals that much damage to that creature's controller.

Pacifism

Enchant creature
Enchanted creature can't attack or block.

Skulking Ghost

Flying
When Skulking Ghost becomes the target of a spell or ability, sacrifice it.

Cannibalize

Choose two target creatures controlled by the same player. Exile one of those creatures and put two +1/+1 counters on the other.

Phyrexian Purge

This spell costs 3 life more to cast for each target.
Destroy any number of target creatures.

Mortuary

Whenever a creature is put into your graveyard from the battlefield, put that card on top of your library.

Morgue Thrull

Sacrifice Morgue Thrull: Mill three cards.

Withering Boon

As an additional cost to cast this spell, pay 3 life.
Counter target creature spell.

Goblin Elite Infantry

Whenever Goblin Elite Infantry blocks or becomes blocked, it gets -1/-1 until end of turn.