Green Sun's Nadir

( {p/w} can be paid with either {w} or {1} and 1 life.)
Reveal the top seven cards of your library. Choose
up to three cards from among them. If those cards
are enchantments or instants and {w}{u} was spent
to cast this spell, or if those cards are artifacts or sorceries and {b}{r} was spent to cast this spell, put
those cards into your hand. If those cards are creatures and at least four green mana was spent to
cast this spell, put them onto the battlefield instead.