Reprocessing Cell

Whenever you cast a creature spell with Overclock,
if no {e} (energy counters) were spent to cast it,
gain {e}.
{t}: The next creature spell you cast this turn has Overclock 2. (As an additional cost to cast this
creature, you may pay up to 2 {e}. For every {e} paid
this way, this creature enters the battlefield with an additional +1/+1 counter).