Legendary Planeswalker - Mordenkainen
[+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 creature'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."