Sword of Fire and Ice + Leyline of the Guildpact
I could not get sword of fire and ice to equip to any creature in the game. It's the firs time Ive had it happen. The only difference was, I added the card Leyline of the Guildpact to my deck and it was on the field. It's quite vexing.
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Rezzahan#77802 commented
That's because your Sword is all 5 colors due to the Leyline, and grants protection from two of those to the equipped creature. Thus immediately upon equipping state based actions see a protected creature with an equipment attached, that it is protected from, and unattach it due to being illegally attached.