The Red Wizard

Haste
{x},{t}: Exile the top X cards of your library. You may cast any number of cards with total converted mana cost X or less without paying its mana cost.

At the beginning of your end step, if you both own and control The White Wizard, The Blue Wizard, The Black Wizard, The Red Wizard and The Green Wizard, exile them, then meld them into The Wizard of The Coast