Quake, Agent of S.H.I.E.L.D.

White does not usually get to dictate when an opponent's board is allowed to act, but this reframes tapping as a repeatable byproduct of doing what a spell-dense deck already wants to do. The trigger fires on cast, not on resolution, which is the whole engine: every noncreature spell you put on the stack lets you tap something before that spell even resolves, so a counterspell aimed at your instant still gets its value banked, and an opponent watching you cast a burn spell has already lost a blocker before combat. The target is your choice each time: a would-be attacker, a mana source at the end of an upkeep, or the same untapped threat every turn to keep it out of the game. It is a soft tap rather than a lasting stun, so it kills nothing on its own, but chained across a turn full of cheap spells it stacks into a tempo drag the pilot controls entirely. The design's real interest is the color-pie seam it sits on: prowess-style payoffs reward casting piles of cheap noncreature spells, and tapping is a control tool white shares with blue, so this asks you to build around spell volume rather than a single explosive turn. The 3/3 body is incidental; the ceiling scales with how many spells you can pack into a turn, not with combat math.