Doom Cannon

As Doom Cannon enters the battlefield, choose a creature type.
, , Sacrifice a creature of the chosen type: Doom Cannon deals 3 damage to any target.

Mistform Dreamer

Flying
: Mistform Dreamer becomes the creature type of your choice until end of turn.

Canopy Claws

Target creature loses flying until end of turn.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)