Foundry of Ages

When Foundry of Ages, another legendary artifact, or a legendary blue creature enters the battlefield under your control, you get {e}{e}{e}{e}(four energy counters).
{t}, Pay {e}{e}{e}{e}: Put a Temporal Counter on Foundry of Ages.
{x}, Pay X {e}{e}, remove X Temporal Counters from Foundry of Ages: Take X extra turns after this one.