Reckless Amplimancer

The math is the pitch: a repeatable five-mana ability that doubles power and toughness, so a 2/2 becomes 4/4, then 8/8, then 16/16 as fast as you can feed it green. A linear pump like Giant Growth adds the same fixed number no matter how many times it resolves; doubling compounds, which means the sixth activation is worth as much as the previous five combined. Timing, not cost, is what contains the payoff. The entire stack of doublings vanishes when the turn ends, converting all that invested mana into one explosive attack rather than a permanent monster. The body reverts to a fragile 2/2 the instant the turn is over, so every point of mana you sank in walks off the board unless the swing already closed the game. That reframes the two-mana body as a placeholder: it trades poorly on the ground and only earns its slot once you have surplus mana and a clean attack step to convert. The Elf Druid line makes the loop legible. Green's ramp tribes exist to manufacture more mana than a deck can reasonably spend, and this is a creature built to consume all of it in a single profitable burst.