Mordenkainen
Legendary Planeswalker — Mordenkainen · {4}{U}{U}
+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."
From €1.52 at Cardmarket