bug
When playing against a Davriel, Soul Broker, the offer of "Spells you cast cost 1 black less to cast" actually lets cards cost colorless to cast if there are multiple of that offer accepted, or are just colorless cards. For example, my opponent had 2 of those offers accepted, but could pay 1 mana for cards like Morbid Opportunist, and cast mind stone and treasure map for free. The offer is supposed to only reduce the cost of the black mana symbol, not the total cost afterwards.
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niot5#43565
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