Xerneas, Genesis Wave

When Xerneas, Genesis Wave enters the
battlefield, reveal the top 7 cards of your library.
Put any number of permanents among them
with a converted mana cost of 7 or less onto the
battlefield, then put the rest on the bottom of
your library in a random order.
{g}{g}{g}: Creatures you control get +2/+2 until
end of turn.
A force of pure creation.