To play a V-Union Card, you need to play all 4 parts from your discard pile onto your bench
When Pokémon-V-UNION has been Knocked Out, your opponent takes 3 Prize cards.
Dance of the Crowned Sword
During your opponent's next turn, the Defending's Pokémon's attacks do 150 less damage (before applying Weakness and Resistance)
Union Gain
Attach up to 2 Energy from your discard pile to this Pokémon.