Boneyard Mycodrax is a rare Creature — Fungus card from Commander 2020 (C20), collector number 40. Current market price: $0.39, TCGplayer market prices via Scryfall.
Boneyard Mycodrax's power and toughness are each equal to the number of other creature cards in your graveyard. Scavenge {4}{B} ({4}{B}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)