Hydra Trainer

The exert trigger looks like a payoff bolted onto a warm body, but the real design is a bet on how many counters you can scatter across your board. The pump reads off the count of every counter on every permanent you control, not just this creature's own, which quietly makes it a lord for more than +1/+1 counter decks: charge counters, loyalty on planeswalkers, anything that accumulates all feed the same number. That total is the axis the whole card pivots on. With an empty board it does nothing, but each counter you bank elsewhere widens the swing here for free. The self-contained adapt ability is the floor that keeps it from dead-drawing: for three mana it stacks two counters on its own back, which then feed the exert math on a later turn, so the card can bootstrap its own payoff in a pinch. The exert cost is the honest part of the deal. It skips your next untap step, so you are trading a blocker and a future attack for a burst of stats now, and locking the trigger to combat keeps it from doubling as an end-of-turn pump. The reason it rewards building around is the compounding: the counters do double duty, sizing your creatures on their own and then all cashing out through this one attack.