Evoke {1}{U} (You may cast this spell for its evoke cost. If you do, it’s sacrificed when it enters the battlefield.)

When Frost Giant enters the battlefield, tap another target creature. That creature doesn’t untap during its controller’s next untap step.

Unearth {5}{U} ({5}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)