Patriar's Humiliation doesn't turn off Harbinger of the Seas - but looks like it does
I was playing brawl, and the opponent cast Harbinger of the Seas. I cast Patriar's Humiliation on it, which grayed out the text of nonbasic lands are island, but all non-basic lands on the battlefield were still islands. You can tell from this screenshot where my Hushwood Verge has a blue outline. I could only tap my non-basics for blue mana.
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Rezzahan#77802
commented
Not a bug. Ability loss cannot shut down abilities that change types. Because layers. Type change happens in layer 4, ability losing in layer 6. Regardless of time stamp, layer 4 is always applied before layer 6.