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You can manage & track your card collection and decks once you create an account and login.
If one card causes battle icons to act as though they were another color, and then a second card causes them to act as though they had previously, then the two effects nullify each other and the battle icons remain their normal color.
Shortened:
Bellicosity and
End Hostilities cancel each other out.
Don't forget to also check out the current ban list!
