Lawmaker

You may only have three Lawmakers in your library.
When Lawmaker enters your battlefield, you may put a permanent card with equal or less mana onto the battleifeld from your hand. Once each turn, you may reveal a card in your hand or a permanent you control and change it's rules. (I.E. change target to each, or to both, if to and. In addition to may. Ect.) When you cast a card that's been rewritten, exile it.