Exrinn, Regrown Darkness

flying, deathtouch, lifelink
whenever you cast a instant or sorcery card that
causes you to gain life, choose one or more:
• gain life equal to its mana cost
• scry X, were X is the amount of life you gained.
Then you may pay {1}. If you do, draw a card
• you may play an instant or sorcery card with
mana value 3 or less from your hand without
paying its mana cost