Imbue with Verve

Frantic (As you cast this spell, you may exile
up to X cards from the top of your library, where
X is the amount of generic mana in this spell's
mana value. This spell costs {1} less for each
card exiled this way.)
Target creature gains hexproof and +X/+X until end of turn, where X is the number of cards exiled with this spell's frantic ability.