Topfji

Topfji doesn't untap during your untap step.
{t}: Choose a card at random from the cube
and exile it. You own that card now. For as
long as it remains exiled, you may cast it and
you may spend mana as if it were mana of
any color to cast it.
"Heiwer die Kiki-Jiki Combo jetz eigentli dri?"