Rishkar, Peema Renegade

Counters were the loose currency of this Elf Druid's era, and this design monetizes them without caring how they arrived. A green three-drop that hands out two +1/+1 counters on arrival already spreads a fair body of stats across your board; the second clause is the conversion engine, granting a tap-for-green ability to each creature you control that carries a counter. That distinction is the whole strategic axis. It reads the presence of a counter, not the source: a Hardened Scales bonus, a proliferate trigger, a planeswalker's team buff, the leftover counter on a token, any of it turns a creature into a mana source the moment this resolves. One creature with three counters still taps for a single green; the multiplier is width, not depth, so the payoff scales with how many bodies carry counters rather than how many stack on one. The two enter-the-battlefield counters seed the engine even in a deck with no other synergy, so a bare board still yields something, but the ceiling lives in a counters-matter shell where a developed team suddenly floods green. It is less a mana dork than a layer laid over everything you have already assembled. The fragility is the counterweight: a 2/2 with no protection running a board-wide engine invites removal, and most of that acceleration switches off the instant it leaves.