Galactic Conquest

At the beginning of your upkeep, reveal the top card of your library and exile it. You may cast that spell until the end of turn.
{4}{u}{u}: Put up to two cards from exile into your graveyard, then return a creature and a land card from your graveyard to your hand.
Earth as invited more than one cosmic being unintentionally into the atmosphere more than once, this may be the last time.