text: If a planeswalker-turned-creature has all loyalty counters removed from it, Spark Rupture's effect will stop applying to it. It will momentarily return to being a planeswalker, but as it has no loyalty counters, it will soon find itself in the graveyard. If this happens, you won't have priority to activate any of its loyalty abilities before the planeswalker is put into its owner's graveyard.