Leonin Battlemage

The untap clause is the part doing the real work here: the pump ability would be a tepid once-per-turn nudge if it stayed tapped, but every spell you cast resets it, so a hand full of cheap spells turns one Cat Wizard into a repeatable team-wide buff over a single turn. That ties the card's ceiling to your spell density rather than to mana: in a deck built to chain casts, the +1/+1 stacks faster than an opponent can answer, while in a slower shell it sits as a 2/3 that pumps once and waits. The design lives at the intersection of Affinity-era Darksteel's cheap-spell economy and a creature whose value scales with how many times you can press the trigger, an early study in rewarding velocity rather than raw card power. The pump itself is modest by design; the untap is the lever that decides whether the body is a curiosity or an engine, and it leaves the rate honest because you still have to spend cards to keep it firing.