Mondo Gecko Bug
Mondo Gecko says discard a card it becomes the color of your choice until end of turn and gains hexproof from that color. When it deals combat damage draw cards equal to the number of permanents your control of that color.
It drew my opponent tow cards in the following turn even if they didn't discarded a second card to have it become red, because they controlled another red permanent.
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Rezzahan#77802
commented
"When it deals combat damage draw cards equal to the number of permanents your control of that color. "
That is NOT what Mondo Gecko's ability says. It ACTUALLY says:
"Whenever Mondo Gecko deals combat damage to a player, draw a card for each color among permanents you control."
It counts colors among permanents the player controls, not the number of permanents of a particular color. So everything worked as it should have.