Portal

portal enters the battlefield tapped
{t}add{w}{u}{b}{r}{g} to your mana pool
{4}{b}{t}sacrifice portal target player discards
the top 3 cards of his deck and scry 3
(to scry look a the top 3 cards of your deck
and put any number under your deck and
the rest on the top in any order, you may shuffle your deck)
It can bring you anywhere