Capacitor

Powered 2, Connect 2, Circuit 4
When Capacitor is powered, remove all charge counters, then put X charge counters on it, where
X is the number of energy counters spent to power Capacitor.
{r},{t}: Remove up to X charge counters from Capacitor and deal X damage to target creature or player.
{t}: Remove up to X charge counters from Capacitor and add that much colorless mana to your mana pool