Where did they get green mana?
My opponent has Agatha's Soul Cauldron and uses it to exile a haywire mite from my graveyard. They already have a couple of creatures with +1/+1 counters on them, but their mana base is all blue and red. Somehow, they generate green mana to use activate haywire mite's ability to exile two of my enchantments. Nowhere on their board was a way to generate green mana, so how did this happen? Opponent had two Astrologian's Planispheres on board, one Vivi Ornitier, and two Stormchaser's Talents. No treasures or other cards that generate green mana.
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MostlyJank#75661
commented
Agatha's Soul Cauldron allows its owner to "spend mana as though it were mana of any color to activate abilities of creatures you control"