Mirrorflow

Indestructible.
{t}: Add {u}{u} or {g}{g} to your mana pool.
{x}{t}: Counter target spell with converted mana cost equal to {x}; if it is an instant or sorcery, you may copy that spell and choose new targets for the copy.
{x}{u}{g}: Sacrifice Mirrorflow, choose X target creatures; for each, put a token copy of it onto the battlefield under your control.