Ashroot Animist

The pump doubles back on itself. Because X equals this creature's own power, a swing turns the 4/4 into a scaling buff engine: the +4/+4 it hands out climbs the moment counters or anthems make the Animist bigger, so the number the trigger reads grows alongside its own board presence. The design tension lives in the target restriction: the buff and the shared trample go to another creature you control, so the Animist cannot pump itself, and it wants a second attacker worth the investment. Pairing the size with trample is the deliberate part, since a +4/+4 on a body that gets chump-blocked is a wasted swing; handing over the keyword guarantees the damage lands. This is the Gruul take on the "haymaker on legs" slot, closer in spirit to an anthem-plus-evasion package than to a straight beater. It asks for a board that is wide but not too wide, one big recipient, and a red-green plan that closes through combat rather than around it. The self-referential scaling is the hook: a creature that reads its own power to size an effect keeps improving as your board grows around it, and the trample rider ensures that growth converts to a life total instead of stalling out against a single blocker.