Guiding Hydra is a rare Creature — Hydra Horror card from Reality Fracture (FRA), collector number 11. Current market price: $0.43 (foil $1.27), TCGplayer market prices via Scryfall.
This creature enters with X +1/+1 counters on it. At the beginning of combat on your turn, you may remove a +1/+1 counter from this creature. If you do, put a +1/+1 counter on each other creature you control.