Golbat

They can suck down over 10 ounces of blood in one go. They have been known to drink so much blood that they can no longer fly.

Ability — Discreet Draw: When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may draw 2 cards.

Air Slash (50): Discard an Energy from this Pokémon.