Crimson Moon's Battleground (CMB-000 XR) [Crimson Moon's Battleground]

[Extension Rule] (This card cannot be in any deck. You can only have up to one card in your extension rule area. You may start the game with this card in your extension rule area. If you do, apply the following text until end of game.) Rulers you own released in Grimm Cluster have " [Tag] (Rulers released in Grimm Cluster)" everywhere. Rulers you own named "Aristella, Ascendant Prince of the Crimson Moon" and/or "Little Red Riding Hood" have Crimson Moon in addition to their other races everywhere and have " [Tag] (Crimson Moon)> " everywhere. Apply the effects of this card already during deck construction and setup.