Stopwatch

At the beginning of your upkeep, put a time counter on Stopwatch. Stopwatch has the following abilities based on the number of time counters on it: 1+ {t}: Add one mana of any color 3+ {t}: Tap target nonland permanent an opponent controls. 5+ {T}: Exile target nonland permament. Return it to the battlefield under its owner’s control at the beginning of the next end step. 7+ {t}: Take an extra turn after this one. This ability can only activate once.