Horned Kavu

A 3/4 for two is a stat line that ordinarily arrives saddled with a clause meant to keep you from playing it; here the bounce is that clause, except the design quietly bets you'll want to use it. Reading the enters trigger as a drawback misses the point: feed it a creature with its own enter-the-battlefield effect and the Kavu becomes a reset button, re-buying a comes-into-play shock or value trigger on a body that profits from being undercosted. With no good target, the trigger is forced and you simply return the Kavu to its own owner's hand, wasting the two mana you spent: that is the floor the design accepts. The color restriction is what shapes it. The trigger reaches only red or green creatures, so the recursion engine lives entirely inside Gruul, precisely the pair that historically had little access to cheap enter-the-battlefield reuse. It comes from an early-era experiment that promoted the Kavu type to a marquee mechanical identity rather than a flavor footnote, and it remains among the most efficient bodies in that line for anyone willing to assemble a board worth re-buying. The synergy is not incidental; the entire rate is borrowed against the assumption that you have something better than the Kavu to return.