Overwork

When this enchantment enters the battlefield,
put 2 -2/-1 counters on any number of target creatures. At the beginning of each end step, put
an energy counter on this card. Once this card has
7 energy counters, remove all of the counters on
this card. Add 8{e} to your mana pool. Remove all
-2/-1 counters from the creatures on the
battlefield. The creatures that had -2/-1 counters
removed receive +3/+2 until end of turn for each
-2/-1 counter removed. You may pay 8{e} to give
each creature -2/-1 u