Behemoth of Vault 0

Here is a colorless six-drop that pays for its removal only after it dies, which makes the four energy it banks on entry function less like a bonus and more like a fuse. The death trigger is the whole design: a scaling, energy-priced destroy effect that can hit any nonland permanent, but only if you have stored up enough charge to cover its mana value. Four counters straight from the body means the Behemoth can answer most early and midrange threats on its own, and a deck already producing energy can point it at something much larger. The elegance is in the sequencing pressure it creates: this is a creature you want to trade or throw into combat, because its best turn is the one it does not survive. Trample and a 6/6 frame keep it honest as a beater in the meantime, so the removal is never the only thing it is doing. Where a Nekrataal-style dies-to-value creature spends its removal once and moves on, the payment here is elastic and shared across the deck's energy economy, turning a one-shot kill spell into a resource-management question: spend the counters killing something now, or hold the Behemoth back and let its stockpile grow into a bigger answer later. Colorless removal that scales is rare, and building the effect around energy rather than color pips is what lets it slot into decks that would never touch a black kill spell.