|Transient card properties|
Cards of rarity, along with those of rarity, generally always have an associated card related by a shared transient. They usually have superior stats and more elaborate kits to their 3-star card. In the story, the artwork of transients of this rarity are often used for action sequences or other key moments.
Limit breaking a card requires power stones and spell tokens whose quantity scales with rarity. A full list of cards with for their rarity can be found here.
AR Card Limitation
AR Equipment can only be equipped on cards that match its limitation criteria. Rarity is one of the potential criteria.