The Mentat Emperor

Vigilance
Ward:{2}
The Mentat Emperor can't be blocked.
Whenever The Mentat Emperor deals damage to
an opponent, exile the top card of each players
library with a spice counter on it.
{t}: Choose an exiled card an opponent owns
exiled with The Mentat Emperor, you may cast
that card. If you cast a spell this way you may
spend mana as though it were mana of any
color to cast it.