Hot Potato

Hot Potato starts with one cringe counter.
{1}: Deal X damage to any target, where X is the amount of cringe counters on Hot Potato. Target opponent gains control of Hot Potato.
Your opponents can gain control of Hot Potato on their turns by paying {5}.
When the controller of Hot Potato changes, remove all cringe counters from it except for one.
At the beginning of your end step, double the amount of cringe counters on Hot Potato.