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That means that: Your mono-black EDH deck can include Beseech the Queen, because it's a mono-color, hybrid mana card that also has mono-color color identity, but You can't include Brutal Hordechief: Hordechief is a mono-black card, but its color identity is due to the in its rules text

Card not found (rare) is a new Card not found of sorts

Removing only artifacts is very narrow, and unlike Rebuild, Hurkyls Recall doesnt have the fail case of cycling

The downside is that you cant cast spells from your hand with that mana, but I see it as an opportunity to build a unique Simic deck that doesnt care much for the contents of your hand