Ashiok, Dream Render is a rare Legendary Planeswalker — Ashiok card from Secret Lair Drop (SLD), collector number 399. Current market price: $18.49 (foil $20.48), TCGplayer market prices via Scryfall.
Spells and abilities your opponents control can't cause their controller to search their library. −1: Target player mills four cards. Then exile each opponent's graveyard.