Genesis Hydra is a rare Creature — Plant Hydra card from March of the Machine Commander (MOC), collector number 298. Current market price: $0.40, TCGplayer market prices via Scryfall.
When you cast this spell, reveal the top X cards of your library. You may put a nonland permanent card with mana value X or less from among them onto the battlefield. Then shuffle the rest into your library. This creature enters with X +1/+1 counters on it.