Blizzards of Cryosis

Tap two target creatures. They don't untap
during their next untap step. If a source deals
damage to those creatures this turn, it deals
enough damage to destroy them.
At the beginning of your end step, if you cast Immolation of Incendrix this turn, you may transform Blizzards of Cryosis and return it
to your hand from your graveyard.
Cryosis gives mercy to no one.