Kithkin Armor

Enchant creature
Enchanted creature can't be blocked by creatures with power 3 or greater.
Sacrifice Kithkin Armor: The next time a source of your choice would deal damage to enchanted creature this turn, prevent that damage.

Mischievous Poltergeist

Flying
Pay 1 life: Regenerate Mischievous Poltergeist.

Razortooth Rats

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Sawtooth Ogre

Whenever Sawtooth Ogre blocks or becomes blocked by a creature, Sawtooth Ogre deals 1 damage to that creature at end of combat.

Llanowar Druid

{T}, Sacrifice Llanowar Druid: Untap all Forests.

Coils of the Medusa

Enchant creature
Enchanted creature gets +1/-1.
Sacrifice Coils of the Medusa: Destroy all non-Wall creatures blocking enchanted creature.

Mistmoon Griffin

Flying
When Mistmoon Griffin dies, exile Mistmoon Griffin, then return the top creature card of your graveyard to the battlefield.

Teferi's Veil

Whenever a creature you control attacks, it phases out at end of combat. (While it's phased out, it's treated as though it doesn't exist. It phases in before you untap during your next untap step.)

Heavy Ballista

{T}: Heavy Ballista deals 2 damage to target attacking or blocking creature.

Blossoming Wreath

You gain life equal to the number of creature cards in your graveyard.

Maraxus of Keld

Maraxus of Keld's power and toughness are each equal to the number of untapped artifacts, creatures, and lands you control.

Duskrider Falcon

Tendrils of Despair

As an additional cost to cast this spell, sacrifice a creature.
Target opponent discards two cards.

Angelic Renewal

Whenever a creature is put into your graveyard from the battlefield, you may sacrifice Angelic Renewal. If you do, return that card to the battlefield.

Tolarian Drake

Flying
Phasing (This phases in or out before you untap during each of your untap steps. While it's phased out, it's treated as though it doesn't exist.)