Ariados

Reactive Poison (10+): Does 10 damage plus 30 more damage for each Special Condition affecting the Defending Pokémon.

Spider Trap: The Defending Pokémon is now Asleep and Poisoned. Before applying this effect, you may switch 1 of your opponent's Benched Pokémon with 1 of the Defending Pokémon. If you do, the new Defending Pokémon is now Asleep and Poisoned. Your opponent chooses the Defending Pokémon to switch.