Illusionary Mask

[Variable Colorless]: You may choose a creature card in your hand whose mana cost could be paid by some amount of,/all of, the mana you spent on [Variable Colorless]. If you do, you may cast that card face down as a 2/2 creature spell without paying its mana cost. If the creature that spell becomes as it resolves has not been turned face up and would assign/deal damage, be dealt damage,/become tapped, instead it's turned face up and assigns/deals damage, is dealt damage,/becomes tapped. Activate this ability only any time you could cast a sorcery.