Rush of Ice

If the non-awaken part of the spell requires a target, you must choose a legal target. You can’t cast the spell if you can’t choose a legal target for each instance of the word “target” (though you only need a legal target for the awaken ability if you’re casting the spell for its awaken cost).

Rush of Ice tracks the creature, but not its controller. If the creature changes controllers before its first controller’s next untap step has come around, then it won’t untap during its new controller’s next untap step.

You can cast a spell with awaken for its mana cost and get only its first effect. If you cast a spell for its awaken cost, you’ll get both effects.

The land will retain any other types, subtypes, or supertypes it previously had. It will also retain any mana abilities it had as a result of those subtypes. For example, a Forest that’s turned into a creature this way can still be tapped for {G}.