Valley of Memories

Valley of Regrets enters the Battlefield tapped.
When Valley of Memories enters the battlefield, exile a creature card from a graveyard with converted mana cost 4 or less.
{t}: Add {g} or {u} to your mana pool.
{3}{g}{u}: Valley of Regrets becomes a copy of a creature exiled with Valley of Regrets, it is still a land.