The Retreat Cost of each Psyduck in play (both yours and your opponent's) is Colorless less.
You may play only 1 Stadium card during your turn. Put it next to the Active Spot, and discard it if another Stadium comes into play. A Stadium with the same name can't be played.
Paradise Resort is card #45 of 215 in Scarlet & Violet Black Star Promos (2023), a Promo illustrated by Naoki Saito.