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