Wolfbat

The recursion is priced against your own draw engine rather than your mana. A vanilla 2/2 flier at this rate would be filler; the value lives in the second-draw trigger, which converts any repeatable card-flow effect (a Phyrexian Arena analog, a Howling Mine spinning on your turn, a cantrip cracked at the right moment) into a single-black-mana toll that hauls the bat back out of the yard. That coupling is what elevates a small evasive body: it wants to trade in combat or feed a sacrifice engine, then reassemble itself the moment you refuel. The finality counter stops the loop from being free. Each return is a one-shot; die again with the counter on and it exiles rather than mulching back for another cycle, capping the payout at one extra trip from the graveyard per recursion instead of an infinite chain. What lifts it above a minor flier is the axis it occupies: it rewards decks already built to churn cards, folding graveyard resilience into an engine you were running anyway, and it does so cheaply (one black mana, keyed to a trigger whose timing you dictate) enough to fire most turns you bother to.