Brimstone Mage

The level-up mechanic was built to turn a single creature into a mana sink that scales with the game, and this Shaman points that sink at burn. The body is incidental; what you are paying for across the level-up chain is a repeatable damage faucet that climbs from a one-damage pinger to a three-damage one. The arithmetic is steep on purpose: cresting to the top tier costs three full level-up activations on top of the initial cast, and every level-up clause restricts you to your own main phase, so you cannot ramp the engine into being mid-combat or in response to anything. That sorcery-speed gate is the discipline that keeps a Tim variant honest, because a tap-to-deal-three machine gun assembled at instant speed would warp games around it. The lineage here runs back to the long tradition of red pingers, the creatures that tap to deal damage at will: this one rents that ability out in installments rather than handing it over at once. The reward for grinding through every level is that the final mode reads like a recurring burn spell stapled to a creature, an inevitability engine that wins attrition fights once the early aggression has stalled, provided the game lasts long enough to justify pouring that much red into a 2/2's promotion track.