Format refers to the ways you can play standard matches. Playing in Rotation format allows you to play using the five most recent card sets and basic cards in a match. Unlimited format allows you to use all available cards in a match.
In Rotation format, you can use the five most recent card sets and basic cards in a match. This format is recommended for players new to Shadowverse.
Usable Cards as of December 26, 2018 (PT)
7th Card Set: Chronogenesis
8th Card Set: Dawnbreak, Nightedge
9th Card Set: Brigade of the Sky
10th Card Set: Omen of the Ten
11th Card Set: Altersphere
Basic cards (starter cards, main story rewards, Harnessed Flame, Harnessed Glass)
In Unlimited format, players can use all available cards. Note that there may be some restrictions placed on cards.
One-Card Restrictions as of September 26, 2018 (PT)
Aria, Guiding Fairy