Nio, Alchemist Unsparked

when Nio, Alchemist Unsparked enters the battlefield all planeswalkers gain 2 loyalty.
when Nio, Alchemist Unsparked leaves the battlefield all planeswalkers lose 1 loyalty
"a planeswalker unsparked in an unfamiliar place can be dangerous for all of us" -Leanis, Overlord of the overworld