Inductor

Powered 4, Connect 3, Circuit 3
As long as Inductor is powered, whenever you cast a spell, put a charge counter on Inductor for each spell you have cast this turn.
{x} where X is the number of spells you have cast this turn, {t}: Remove any number of charge counters from Inductor and add that much mana of any one color to your mana pool.
All charge counters are removed from Inductor at the beginning of the next end step.