Mordenkainen is a mythic Legendary Planeswalker — Mordenkainen card from Adventures in the Forgotten Realms (AFR), collector number 64. Current market price: $1.45 (foil $1.47), TCGplayer market prices via Scryfall.
+2: Draw two cards, then put a card from your hand on the bottom of your library. −2: Create a blue Dog Illusion creature token with "This token's power and toughness are each equal to twice the number of cards in your hand." −10: Exchange your hand and library, then shuffle. You get an emblem with "You have no maximum hand size."