Innistrad: Crimson Vow

Whispering Wizard | Creature | Human Wizard | Whenever you cast a noncreature spell, create a 1/1 white Spirit creature token with flying. This ability triggers only once each turn. | E. M. Gist

Mirrorhall Mimic | Creature | Spirit | You may have Mirrorhall Mimic enter the battlefield as a copy of any creature on the battlefield, except it's a Spirit in addition to its other types. Disturb {3}{U}{U} (You may cast this card from your graveyard transformed for its disturb cost.) | Justine Cruz

Repository Skaab | Creature | Zombie | Exploit (When this creature enters the battlefield, you may sacrifice a creature.) When Repository Skaab exploits a creature, return target instant or sorcery card from your graveyard to your hand. | Olivier Bernard

Cruel Witness | Creature | Bird Horror | Flying Whenever you cast a noncreature spell, look at the top card of your library. You may put that card into your graveyard. | Vincent Proce

Gutter Skulker | Creature | Spirit | Gutter Skulker can't be blocked as long as it's attacking alone. Disturb {3}{U} (You may cast this card from your graveyard transformed for its disturb cost.) | Viko Menezes

Overcharged Amalgam | Creature | Zombie Horror | Flash Flying Exploit (When this creature enters the battlefield, you may sacrifice a creature.) When Overcharged Amalgam exploits a creature, counter target spell, activated ability, or triggered ability. | Mike Jordana

Grolnok, the Omnivore | Legendary Creature | Frog | Whenever a Frog you control attacks, mill three cards. Whenever a permanent card is put into your graveyard from your library, exile it with a croak counter on it. You may play lands and cast spells from among cards you own in exile with croak counters on them. | Simon Dominic