Loam Dryad

The activation cost reads like a sleight of hand: the dryad taps itself and taps another creature you control, so a single activation requires two bodies to go down and yields exactly one mana of any color. That ratio is what defines it. This is not a board-wide mana battery; it is a once-per-turn fixer that converts a spare creature into a single colored mana while the dryad itself goes offline. The appeal is color flexibility for a one-mana investment: a wide green board that would otherwise be locked into mono-green can splash, and the fuel is any idle attacker, blocker, or token rather than a dedicated rock. The price is steep on two fronts. The dryad has to survive, and at a 1/2 it usually does not survive much; every activation also costs you a creature's combat step, since both the dryad and its victim leave the table tapped. The design descends from the handful of creatures that eat other creatures to make mana rather than producing it solo, punishing an empty board and rewarding going wide, but the two-creature tax makes it a clumsier engine than the convoke logic it superficially resembles. The Dryad Horror type line is the flavor wrinkle: a mana-elf archetype rendered as something corrupted, the only reason a green dork reads as a creature to fear.