Crucible of Souls

Devoid, Indestructible.
Crucible of Souls enters the battlefield name a planeswalker. Whenever a creature leaves the battlefield, put a loyalty counter onto the named planeswalker. Whenever a planeswalker leaves the battlefield, put a number of loyalty counters onto the named planeswalker equal to the other planeswalker's starting loyalty.
"So, on this plane you're made of more flesh than metal? That's different..."-Oberis