
Spell Queller | Creature | Spirit | Flash
Flying
When Spell Queller enters the battlefield, exile target spell with mana value 4 or less.
When Spell Queller leaves the battlefield, the exiled card's owner may cast that card without paying its mana cost. | Adam Paquette

Gisa and Geralf | Legendary Creature | Human Wizard | When Gisa and Geralf enters the battlefield, mill four cards.
During each of your turns, you may cast a Zombie creature spell from your graveyard. | Karla Ortiz

Mercurial Geists | Creature | Spirit | Flying
Whenever you cast an instant or sorcery spell, Mercurial Geists gets +3/+0 until end of turn. | Lake Hurwitz