MTG Cardsmith

Grab your nearest electronic device and create X cards on MTG Cardsmith, then you print those cards and add them to your hand. You can cast them without playing their mana costs. They must be reasonably OP or you automically lose the game.
A real match clincher. No one can truly comprehend the true power of MTG Cardsmith. You can make anything here. Except in this game. You got some limits here.