Hydroid Krasis is a rare Creature — Jellyfish Hydra Beast card from Double Masters 2022 (2X2), collector number 228. Current market price: $0.40 (foil $1.25), TCGplayer market prices via Scryfall.
When you cast this spell, you gain half X life and draw half X cards. Round down each time. Flying, trample This creature enters with X +1/+1 counters on it.