SS Trunks, Primed for Fusion (P-226) - Promotion Cards

[Activate:Main] If your opponent has 4 or more cards in Rest Mode, and you have only "Son Goten : GT" cards in play or no Battle Cards in play : Play this card from your hand, and you can only play Battle Cards using [Union-Fusion] skills for the turn.
[Auto] At the end of your turn, return this card to its owner's hand.