Conclave Mentor

Counter multiplication usually costs real mana and asks for a build committed to the value it prints: the exponential ceiling of Doubling Season, or the enchantment-level tax those effects tend to carry. This trades all of that ceiling for a flat plus-one per counter event on a two-drop small enough to slot under any green-white curve. The exchange is scale for speed. There is no explosive multiplication here, just one extra counter each time counters would arrive, which happens to be exactly the increment that turns a Hardened Scales style incremental deck from a grind into a clock. The death trigger is what makes the design cohere. Aggressive counters decks want to attack and trade, and their usual soft spot is racing burn: they run their bodies at damage and lose the tempo war. The lifegain clause patches that seam, refunding life equal to the mentor's power (a figure its own replacement effect keeps inflating) when it finally dies in combat. It belongs to that family of small green-white creatures that pay off a mechanical commitment rather than a raw stat line, close kin to Hardened Scales in the shell it wants around it but with a warmer body that contributes life instead of only math. The single honest limit is that the bonus counter needs an existing source to trigger off; with nothing else placing counters, you have a 2/2 whose only output is a modest lifegain trigger when it dies.