Island Challenge Amulet (Cosmic Eclipse 265/236)

Rules

Attach a Pokémon Tool to 1 of your Pokémon that doesn't already have a Pokémon Tool attached to it.

The Pokémon-GX or Pokémon-EX this card is attached to gets -100 HP, and when it is Knocked Out by damage from an opponent's attack, that player takes 1 fewer Prize card.

You may play as many Item cards as you like during your turn (before your attack).