Jon, the dumb human

when Jon enters the battlefield, you
may put up to 50 cards from your library
into your graveyard, as long as you control
Jon,you may cast cards from your graveyard.
(you may have up to 5 cards called Jon, the
dumb human in a deck)
{t}- add {b/g}{b/r}{g/u}{g/w}{r/g}{r/w}{u/b}{u/r}{w/b}{w/u} to your
mana pool