Myr Convert is a uncommon Artifact Creature — Phyrexian Myr card from Phyrexia: All Will Be One (ONE), collector number 297. Current market price: $0.24 (foil $0.32), TCGplayer market prices via Scryfall.
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) {T}, Pay 2 life: Add one mana of any color.