Primalcrux

The body is a tally. Count every green pip in the mana costs of permanents you control, and that number is both its power and its toughness, which makes this the most literal reading of a board-as-resource design ever printed in green. The casting cost is doing double work: it pays for the creature while seeding the count, six green symbols toward the total before any other permanent contributes, so a board built to deploy it is already a board that feeds it. The wrinkle is precision about what counts: not green permanents, not green creatures, but green mana symbols in mana costs, so one permanent with a heavily green hybrid or multi-pip cost outweighs a fistful of one-drops. Trample is the closing argument, since a body that scales with a developed mono-green board outgrows any single blocker it bothers to walk through. The fragility is structural and unhedged: there is no fixed floor independent of its own cost, so removing or bouncing your other permanents shrinks it in real time, and a lone Primalcrux on an empty board is a 6/6 resting entirely on the six pips it brought itself. It rewards the all-in green commitment its cost already demands, then collapses the instant that commitment gets pulled apart.