Galecaster Colossus

The engine that turns a board of Wizards into a repeatable bounce cannon. The activation cost is a tap, not a mana payment, which is the whole design: every untapped Wizard you control is another nonland permanent you can send home, and the Colossus itself is a Wizard, so it can bounce with its own tap the turn it stabilizes into a 5/6 body. That reframes the card from a single removal spell into a scaling lockout. Point enough taps at an opponent's board and their permanents stop staying on the battlefield; point them at their lands' worth of blockers and the 5/6 walks in unopposed. The restriction that keeps it from being a hard prison is targeting: it returns permanents you don't control, so it cannot loop a single value creature by bouncing your own engine, and each tap costs you an untapped Wizard. What makes it more than a tribal payoff is the speed. The taps are an activated ability, so the whole thing operates at instant speed, letting you hold up interaction and answer a threat once it lands rather than committing sorcery-speed. It sits at the top of a Wizard-count curve as the reward for going wide on a creature type that rarely gets a finisher this violent, the kind of top-end that punishes a board it survives to see.