[PKM] Magmortar (DP20) [Diamond & Pearl: Black Star Promos]

If the Defending Pokémon tries to attack during your opponent's next turn, your opponent flips a coin. If tails, that attack does nothing.

If Magby isn't anywhere under Magmortar, discard 2 Energy cards from your hand. (If you can't discard 2 Energy cards from your hand, this attack does nothing.)