Loyalty Siphoner

Whenever a player adds or removes loyalty counters from a planeswalker, put a +1+1 counter on this card. That player loses 1 life.
Remove three +1+1 counters from this card, then choose 1:
-Destroy target planeswalker.
-Destroy each emblem created by target planeswalker.
"The elf was annoying, but full of spirit."