Mindspring Merfolk

Exhaust turns a card that would otherwise scale into a card that spikes exactly once, and that constraint is the whole reason this reads the way it does. A repeatable draw-X plus lord effect on a one-drop would be an engine you never stop tapping; the once-only activation converts it into a single, deliberate payoff you save for the turn the mana is there. The design puts two competing incentives on the same ability: raw card advantage that wants X large, and a board pump that wants a wide Merfolk battlefield to reward, and you rarely get to maximize both. Cast it early to hold the tribe's anthem-in-waiting, then dump mana into the exhaust when a stalled board wants the counters more than the cards, or when you are refueling from empty and the counters are gravy. The tap symbol matters too: this competes with attacking and with any other tap ability the body might otherwise supply, so committing to the exhaust is a turn spent developing nothing else. It is a curve-topping ability stapled to a fragile 1/1, which is the honest tension here. You draw and buff on the turn you choose, once, and before that turn it is a lone 1/1 waiting to be answered.