Mystique, Master of Disguise

Prowess, haste

Disguise {5}{r}. This cost is reduced by {1} for each instant and sorcery card in your graveyard. (You
may cast this card face down for {3} as a 2/2
creature with ward {2}. Turn it face up any time for
its disguise cost.)

When Mystique, Master of Disguise is turned face
up, discard your hand, then draw three cards.