Atraxa, Praetors' Voice is a mythic Legendary Creature — Phyrexian Angel Horror card from Double Masters (2XM), collector number 353. Current market price: $63.95 (foil $72.65), TCGplayer market prices via Scryfall.
Flying, vigilance, deathtouch, lifelink At the beginning of your end step, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)