Frostwind Valkyrie

Flying
Coldblood {4}{u}{u}{u} (You may cast this spell for its coldblood cost if no spells has been cast since the beginning of last turn.)
If you cast Frostwind Valkyrie for it's coldblood cost, each opponent skips their next untap step.
"The winds of Anigrima is deadlier than a young dragon's fire" - Thorgrim