Poké-BODY Toxic Gas
As long as Muk ex is your Active Pokémon, ignore all Poké-Powers and Poké-Bodies other than Toxic Gas.
The Defending Pokémon is now Poisoned.
Does 40 damage plus 10 more damage for each Colorless Energy in the Defending Pokémon's Retreat Cost (after applying effects to the Retreat Cost).
When Pokémon-ex has been Knocked Out, your opponent takes 2 Prize cards.