Card Text:
When you play Energy Vortex, choose target opponent.
At the beginning of your upkeep, remove all energy counters from Energy Vortex.
During chosen opponent's upkeep, he or she pays o1 for each energy counter on Energy Vortex, or it deals 3 damage to him or her.
ooX Put X energy counters on Energy Vortex. Use this ability only during your upkeep.