Koga’s Koffing · Gym Challenge (G2) #48

{G} → Smokescreen : 10
If the Defending Pokémon tries to attack during your opponent’s next turn, your opponent flips a coin. If tails, that attack does nothing.

{G}{C} → Obscuring Gas : 30
Flip a coin. If heads, shuffle Koga’s Koffing and all cards attached to it into your deck (after doing damage).