in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.Apex Devastator turns one ten-mana creature spell into four separate cascade opportunities. Each cascade can find and cast a nonland card with mana value below ten, giving a green ramp deck the chance to develop several spells before the Devastator itself resolves. The large creature body is part of the payoff, but the cast triggers are the defining reason to build around it.
Mana engines such as Nyxbloom Ancient and a developed land-ramp package help reach the substantial casting cost. The rest of the deck should contain useful cascade hits across a range of mana values, including interaction, card draw, and permanent-based threats. A well-rounded set of hits produces a more dependable turn than relying on every cascade to reveal an expensive creature.
Each cascade resolves separately, and casting the revealed spell is optional. You may decline a situational spell that would harm your position, though the card is then handled by cascade's normal instructions rather than going to your hand. Spells with X in their mana costs generally use zero for X when cast without paying their mana costs.
Putting Apex Devastator directly onto the battlefield does not trigger cascade. Reanimation and effects such as Last March of the Ents therefore miss much of what makes it attractive. It belongs in decks that expect to cast it, and its cast triggers can still provide value even if the original creature spell is later countered.
