Oracle of the Deep Beyond

{t}: Add two mana in any combination of colors.
Spend this mana only to cast planeswalker spells,
cards not cast from your hand, and cards not from
your starting library, or pay for abilites.
When this card enters the battlefield, you may
draft a card from the cube, then you may shuffle
any number of the remaining cards viewed when
drafting into your library. (Select one of three
random cards from the cube and add it to hand.)