Urtet, Remnant of Memnarch is a rare Legendary Artifact Creature — Myr card from Phyrexia: All Will Be One Commander (ONC), collector number 42. Current market price: $6.66 (foil $6.97), TCGplayer market prices via Scryfall.
Whenever you cast a Myr spell, create a 1/1 colorless Myr artifact creature token. At the beginning of combat on your turn, untap each Myr you control. {W}{U}{B}{R}{G}, {T}: Put three +1/+1 counters on each Myr you control. Activate only during your turn.