Joscu's Damnable Act

As an additional cost to cast this spell sacrifice any number of Rifts. This spell costs {2} less to cast
for each Rift you sacrifice this way.
Reveal the top X cards of your library. You may
put any number of permanent cards with mana
value X or less from among them onto the battlefield. Put the rest into your graveyard.
You pray? Why pray in the face of magnificence, your
old god is dead, and I am right here! I am god, you insolent neonate!