Aclazotz, God of the Night

Flying, lifelink
As an additional cost to cast this spell, you pay 2
life as many times as you like, costing {2} less for
each time you payed life this way.
Whenever a player pays life, add that much {b} to your mana pool.
Aclazotz has indestructible as long as you have
lost 4 or more life this turn