Apex Devastator is a mythic Creature — Chimera Hydra card from Modern Horizons 3 Commander (M3C), collector number 220. Current market price: $7.73, TCGplayer market prices via Scryfall.
Cascade, cascade, cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order. Multiple instances of cascade each trigger separately.)