D.A.R.I, The Monstrous Schemer

{x}{3}: Cast a card you own that is not in the game
where x is the converted mana cost of the card
At the beginning of your end step if you casted 4
or more cards this way,
exile D.A.R.I, The Monstrous Schemer
and return him transformed
"To create a Paradise you must create a living Hell"
-D.A.R.I