Altar of the Sphinx

Whenever you cycle or discard a card, you may
pay {2}. If you do, draw a card and you lose 1 life.
Whenever a nontoken creature you control is put into your graveyard from anywhere, you may pay {4}. If you do, Altar of the Sphinx become a legendary 4/4 blue Sphinx artifact creature with Indestructible and flying until end of turn.
Sacrifice a creature: Add {c}{c} to your mana pool.