Hullbreaker Horror

The tension every big blue payoff has to resolve is that it wants to end games but sits at the top of the curve, right where control decks are most vulnerable to being punished on the turn they tap out. This answers that by refusing to be a liability: flash lets it land on an opponent's end step or in response to a threat, and the can't-be-countered clause means the one thing a mirror-match rival would do to stop it does not work. What makes the body more than a 7/8 wall is the trigger economy. Every spell you cast (not just the first, not once per turn) offers a bounce, and because the modes cover both spells on the stack and nonland permanents, a single burst of cheap cantrips turns into a soft lock: you counter their answers by returning them to hand, then unwind their board one permanent at a time while never running out of gas. The "up to one" wording matters as much as the effect, since it lets you fire the trigger with nothing worth targeting and keep chaining. The design reads as blue's answer to the question of how to build a finisher that is also a control element, a haymaker that protects itself and grinds simultaneously rather than asking you to choose. Land it with a full grip and the game tends to fold on your terms.