Evermyst's Curse

All planeswalkers become X/X legendary
creatures rather than planeswalkers, where X
is their converted mana cost.
They have: "{t}: Activate a positive loyalty
ability that belonged to this planeswalker."
and "{t}, {x}: Activate a negative loyalty ability
that belonged to this planeswalker, where X is
its cost.".
Even in death Vrinndell sows misery among all.