[PKM] M Diancie EX (XY44) [XY: Black Star Promos]

During your opponent's next turn, prevent all damage done to each of your Pokémon from your opponent's Pokémon-EX. (If this Pokémon is no longer your Active Pokémon, this effect ends.)

Mega Evolution rule: When 1 of your Pokémon becomes a Mega Evolution Pokémon, your turn ends.

Pokémon-EX rule: When a Pokémon-EX has been Knocked Out, your opponent takes 2 Prize cards.