Planar Seal

Loyalty abilities that would cause a planeswalker an opponent controls to gain loyalty cause them to lose that much loyalty instead.
Whenever a you use a loyalty ability of a planeswalker you control, each planeswalker you control gains 1 loyalty.
"They say there are endless worlds and our ignited sparks can take us there. Why then are we trapped here?" -Iosefka Dauntless