These cover the cards and story across multiple sets rather than belonging to a single set
You can identify what rarity your Lorcana card is by looking at the rarity symbol at the bottom of the card, in the centre of its border
But Friends is singable, so usually will cost you zero, whereas with this you have to pay the ink to play it
Dragonfire Dive - During your turn, Dion and other Knights you control have flying
Equip variants or equip abilities with restrictions, like the "equip legendary creature" ability of Wrecking Ball Arm, are still equip abilities, and their costs will be reduced by Helitrooper's last ability
This pairs very well with Chocobos since they gain stats when a land enters, so if you can play multiple lands per turn, then Summon: Fat Chocobo's Kerplunk ability can make blocking your Chocobos pointless