At the beginning of your end step, target opponent gains control of this artifact and puts a charge counter on it.
At the beginning of your upkeep, this artifact deals damage to you equal to the number of charge counters on it.

: Put a charge counter on this artifact or remove one from it.
If you activate Jinxed Choker’s activated ability, you choose to either add or remove a counter when the ability resolves.
“You” is always Jinxed Choker’s current controller.