Borealis, the Freezing Fog

Flying

When Borealis enters, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Borealis.

Spells your opponents cast that target Icefall Regent cost {2} more to cast.

"The ice dragons were once lords of the mountaintops long ago, until they were defeated by the Fire Giants and chased from the peak." — Finger Reader Enya