Excalibur, Lone Blade

When Excalibur, Lone Blade enters the battlefield or attacks, if you have no {e}, you get {e}{e}. (two energy counters)
Blade Dash — {t}, Pay {e}{e}: Excalibur deals damage equal to its power to target creature. When that creature dies this turn, you get {e}{e} and untap Excalibur.