Energy Vortex (64) [Mirage]

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