Species Gorger

A 6/6 for five in two colors is aggressively costed, and the upkeep tax is the bill: every turn you keep this on the battlefield, a creature you control goes back to hand. The drawback is mandatory and untargeted by an opponent, which flips the usual evaluation of a "downside" creature. Left to its own devices it eventually bounces itself, a clock that resets the board you spent mana building. But the same trigger is an engine if you stock it with enter-the-battlefield effects: returning a creature to hand the turn before lets you replay its trigger, and a self-bounce is a non-event when the creature you return is this Frog Beast's own backup or a value piece you wanted to recast anyway. The design lives entirely in who controls the return. Read as a beater, the body is a liability waiting to happen; read as the heart of a recursion loop, the upkeep timing hands you a free bounce every turn at no mana, which is exactly the resource a value deck is short on. That gap between an obligation and a piece of infrastructure is what makes the card worth building around: the same trigger that wrecks a creature deck feeds an ETB deck, and nothing about the card decides which one you are.