A-Vivi Ornitier

Start it at zero power and it makes zero mana, which is the whole loop laid bare: this is a mana engine that has to bootstrap itself off the very spells it exists to fuel. The 0/3 body enters as a dead battery, and each noncreature spell you cast does double duty, growing the power that determines how much mana it taps for while pinging every opponent for one. That coupling is the design's cleverness: the counter is both your Storm counter and your clock. A build that leans into cheap cantrips and rituals turns Vivi into a snowballing generator, where every spell pays for the next and shaves a life total in passing, so the same engine that ramps you also closes the game without ever attacking. The friction is that it demands the counters land before it produces anything, so the first turn it resolves it is pure liability: a summoning-sick wall that can neither block for much nor make mana until you have spent cards to charge it. The reward scales quadratically because power feeds mana feeds more spells feeds more power, which is exactly the kind of positive-feedback body that spellslinger decks have always wanted and rarely gotten at three mana in the color pair that produces the most instants and sorceries. The opponent-damage rider is the part that makes it more than a value piece: it converts a ramp engine into a wincon, so the deck never has to leave its lane.