Invalid signet colors are allowed in brawl decks
Selesyna (UW) and Dimir (UB) signet can be put in a deck with a UG commander. But the color identity rule makes cards with mana symbols that aren’t in the commander’s color identity illegal.
Note the signets in the background of the commander screenshot.
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tink#45835
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sparksfamilyvalues#95319 commented
The Signet's are only available from the Alchemy card Relics of the Rubblebelt, which is a green card