Katalis, Reality Shifter

Whenever Katalis, Reality Bender deals combat
damage to a creature, that creature's owner may sacrifice it. If they do, that player reveals cards
from the top of their library until they reveal a
nonland permanent card with mana value less
than or equal to the sacrificed card's mana value.
{u}{r}{t}: Katalis, Reality Bender deals damage
equal to its power to target creature.