Kremlo, Generous Dealer

Dice Divination: At the beginning
of your upkeep roll a D6:
1-2: Add {c} to your mana pool
at the beginning of your next main phase.
3-4: Add {u},{r}, or {g} to your mana pool
at the beginning of your next main phase.
5-6: Reveal the top card of your library.
If that card has a converted mana cost of 0,
you may cast it without paying its mana cost.