Agatha’s soul cauldron and phyrexian mana
Agatha’s soul cauldron enables you to pay mana of any color to activate abilities. When paired with a card like Unctus, which has a phyrexian mana ability, the UI usually prompts you to select whether you’d like to pay with life or mana, except the option for paying with life disappears and leaves only {1} as an option.
I play on mobile, so am unsure if this applies to other platforms
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Sunborn Dragon#95701 commented
Its even more fun when a counter is on a permanent that had the ability anyway, and you suddenly can't pay its normal costs because it has a new broken instance of the ability. i am also playing on mobile. experienced the same issue granting captive wierd the abilites of captive wierd