Redshift, Rocketeer Chief

Ramp that indexes to itself: the mana this Goblin taps equals its power, so a 2/3 body yields two mana of any one color, and every counter or anthem that inflates its power inflates the payout in lockstep. What narrows it away from generic acceleration is the spend clause: the mana funds activated abilities only, so it cannot power out spells from hand and instead feeds the engines already sitting on the battlefield. That points the card at boards stacked with expensive activations rather than at raw tempo, a stranger and more specific job than the Llanowar Elves rate implies. Vigilance stitches the two modes together, letting it swing and still leave the mana ability up during the opponent's turn. The exhaust cost completes the design as a once-per-game release valve, priced at a deliberately steep ten-plus mana to dump any number of permanent cards from hand straight onto the battlefield. Put together, the build wants you to grow the number in the corner of the P/T box, hoard permanents, and cash a mountain of activation mana into a board state in a single turn. The whole payoff structure hinges on how large you can make that power figure, since the mana produced, and therefore everything downstream of it, scales with nothing else.