Seviper

For many generations, it has feuded with ZANGOOSE. It whets its bladed tail on rocks for battle.

Tail Blade (20): Flip a coin. If heads, your opponent can't play any Trainer cards from his or her hand during your opponent's next turn.

Poison Tail (30+): Flip a coin. If heads, this attack does 30 damage plus 30 more damage and the Defending Pokémon is now Poisoned.