Marut

The eight-mana body is a red herring; the whole design is a payoff for a resource you would never think to hoard. A 7/7 trampler with no Treasure trigger is unplayable at this cost, and that is precisely the point: the construct is priced as near-blank so the Treasure clause can carry it. Cast it with eight Treasures and it hands you eight more, refunding the entire spend and turning a mana sink into a mana engine that has already paid for the next big play. The mechanism reads as gimmicky until you notice how many builds generate Treasures faster than they can spend them; here that surplus finally has somewhere to go, converting a stockpile that was quietly rotting on the battlefield into a fresh stockpile plus a real 7/7 clock. The conditional keeps it disciplined: no Treasure mana, no trigger, so it never becomes a slam-anywhere finisher in a deck without the infrastructure. It asks you to have already committed to a Treasure theme before it does anything, then rewards that commitment by refusing to consume the resource it runs on. That inversion (a mana sink that gives the mana back) is the actual invention, and it belongs to the family of big colorless payoffs that reward a specific engine rather than raw ramp.