Bristling Hydra is a rare Creature — Hydra card from Kaladesh Promos (PKLD), collector number 147s. Current market price: — (foil $0.68), TCGplayer market prices via Scryfall.
When this creature enters, you get {E}{E}{E} (three energy counters). Pay {E}{E}{E}: Put a +1/+1 counter on this creature. It gains hexproof until end of turn.