Sword of Planes End

Whenever a planeswalker enters the battlefield under your control, add a power counter to Sword of Planes End, then add X loyalty counters to that planeswalker, where X is the number of power counters on Sword of Planes End
Whenever a planeswalker enters the battlefield under an opponents control, exile that planeswalker for X turns, where X is the number of power counters of Sword of Planes End.