Petrified Wood-Kin is a rare Creature — Elemental Warrior card from Guildpact (GPT), collector number 91. Current market price: $0.27 (foil $1.19), TCGplayer market prices via Scryfall.
This spell can't be countered. Bloodthirst X (This creature enters with X +1/+1 counters on it, where X is the damage dealt to your opponents this turn.) Protection from instants