MAGOSI, THE WATERVEIL

Magosi, the Waterveil enters the battlefield tapped.
{t}: Add {u} to your mana pool.
{u}, {t}: Put an eon counter on Magosi, the Waterveil. Skip your next turn.
{t}, Remove an eon counter from Magosi, the Waterveil and return it to its owner's hand: Take an extra turn after this one.