Elesh Norn, Mother of Machines is a mythic Legendary Creature — Phyrexian Praetor card from Phyrexia: All Will Be One Promos (PONE), collector number 10p. Current market price: $25.92 (foil $25.75), TCGplayer market prices via Scryfall.
Vigilance If a permanent entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time. Permanents entering don't cause abilities of permanents your opponents control to trigger.