Removal

Mythical As long as there is a card named Removal
in the graveyard, exile, or on the battlefield, you
cannot cast Removal.
When this card enters the battlefield, Exile target planeswalker until end of turn, that card's
controller gets an X/X creature token with indestructible and the name of that planeswalker.
Then do this for all other planeswalkers on the battlefield. Exile them at the beginning of the
next upkeep.