As Energy Vortex enters, choose an opponent. At the beginning of your upkeep, remove all vortex counters from Energy Vortex. At the beginning of the chosen player's upkeep, Energy Vortex deals 3 damage to that player unless they pay {1} for each vortex counter on Energy Vortex. {X}: Put X vortex counters on Energy Vortex. Activate only during your upkeep.