Hylda of the Icy Crown

The design premise is a payoff for a resource nobody was farming: your opponent's untapped creatures, tapped by your own effects rather than combat. Blue-white had accumulated a stack of tempo tools that tap down blockers and attackers (the Frost Titan school, the humble Icy Manipulator, every Frost Breath-adjacent "tap target creature" rider), all of them previously spending that effect purely to unstick an attack or blank a defender. This gives the tap itself a value engine, and the modal payoff scales with how you want to use it: a body, a team pump, or card advantage, one at a time. The trigger's phrasing is the wrinkle worth reading twice: it fires whenever you tap an untapped creature an opponent controls, which means the tapper can be anything, a repeatable activated ability, a cheap instant, an aura, even a creature with a tap-a-blocker attack trigger, and each individual tap is a separate opportunity to pay. That turns marginal, tempo-only effects into modular advantage and asks the deckbuilder to hunt for the cheapest, most repeatable way to tap a single creature rather than the flashiest one. It is a card that rewards density of tiny interactions over one big swing, and a 3/4 body that survives long enough to bank several of them.