Reality Tesseract

Whenever a player would cast a spell from his or her hand, that player instead exiles that spell
face-down. Then, that player copies a spell chosen at random exiled by Reality Tesseract and casts it without paying its mana cost. That player may choose new targets for the copy.
{7}: Each player reveals the top card of his or her library. Exile all nonland cards revealed this way. If a card named Reality Tesseract is exiled in this way, you win the game.