Slytherin Student

Whenever you play an artifact card or a Slytherin (green) card, put 1 point on this card.
-1, {t}: Return a card at random from the discard
pile then lose 2 life.
.
-20, {t}: Select a Legendary Creature to become headmaster, then if that card is Slytherin or
matches your allegiance, you win the game.