Noice.
So looking at the current frost cards in the game that directly apply ice shields, their abilities are just named ice shield (frost sorceress, ice shield tower, area ice shield, shield building).
Other effects do something more than just apply an ice shield to another unit/units/building (winter witch, avatar of frost, mountaineer, warden's sigil, ice guardian) and therefore have a different name.
If this spell applies an ice shield once to a group of units then the abilities should be called blessed ice shield and tainted ice shield so that it's consistent with the rest of the game.