azur lane booster box Re-Bath for You Pack, Vol. 3 : Toys & Games each with 8 cards Weiss Schwarz Trading Card Game

During your 1st Standby Phase after this card's activation: Show 1 Fusion Monster in your Extra Deck and send the Fusion Materials listed on it from your Main Deck to the GY

From here, you can either use it to synchro summon into some seriously powerful extra deck monsters, or you can tribute Felis to activate its second effect: By tributing this card, you can target and destroy a monster your opponent controls, while also milling your deck for 3 cards

Only winners get a copy, however

In the fictional world of Yu-Gi-Oh!, people play a card game called Duel Monsters

is all about deck building, the entire process is pretty nice in the game