Celestial Regulator

A Frost Titan effect split into two halves and priced by how the second half is earned. The enter trigger always taps a creature you don't control; whether that creature stays down through its controller's next untap step hinges on the board when the Angel lands. If you already control a creature carrying a counter, the tap becomes a freeze that strands a blocker or an attacker for a full turn cycle. If you don't, you get a one-shot Twiddle bolted to a 2/3 flier: legal, toothless. That rider quietly points the card at a specific shell, and the wording is stricter than it first reads: the counter has to sit on a creature you control, not on a planeswalker, an enchantment, or anything an opponent owns. A +1/+1 counters build, a proliferate outlet, or any deck that reliably marks up its own bodies switches the freeze on for free, which places this in the lineage of white-blue tempo creatures that gate their payoff behind a condition trivial enough to ignore and rewarding enough to build toward. The swing is a single moment rather than an engine: because the lock rides an enter trigger, it fires once and the tempo lives on the beat you cast it, unless a blink or bounce effect recycles the trigger into a recurring stranding. The two-color cost and modest evasive body keep it a role-player that borrows the rest of the deck to turn a tap into a turn.