Itzquinth, Firstborn of Gishath

The Gruul fight spell, rebuilt so nobody fights back. When it enters, an optional payment points a Dinosaur you control at another creature and deals damage equal to that Dinosaur's power, with no return blow. That one-sided direction is the departure: Prey Upon and the rest of the fight lineage trade damage both ways, while this reads the power already on the board and delivers it clean. The optional cost is a genuine release valve, not a tax: with no worthwhile Dinosaur to fire and no target worth killing, you decline the payment and keep a hasty 2/3, a perfectly reasonable curve filler on its own. And because it is a 2-power Dinosaur the moment it lands, it can serve as its own damage source in a pinch, throwing two damage at another creature even when the rest of the board is bare. The value lives entirely in the entrance, though: this is a one-time trigger tied to the creature arriving, so it is a burst of removal rather than an engine you tap each turn. The name carries lineage weight too. Gishath's firstborn, a cheap red-green legend seeding a tribe that historically demanded a mountain of mana to function; putting a fight effect on a two-drop asks only that the surrounding creatures be bodies worth pointing.