Hydra's Lament

Equipped creature gets +1/+1 and has Prowess.
Whenever equipped creature deals combat damage to a player, get {e}.
Whenever you cast a blue noncreature spell, you may pay {w}{w}{e}. If you do, equipped creature gains Lifelink until end of turn.
Whenever you cast a white noncreature spell, you may pay {u}{u}{e}. If you do, untap equipped creature.