Had to pay for Etali ETB free spell
When I cast Etali, Primal Conqueror, it exiled a Sheoldred, the Apocalypse and a Herd Migration. I was able to cast Sheoldred fine, but then when it went to cast Herd Migration, it made me pay 1 (any color) before it would cast. I had the mana available and was able to cast it, but I can't figure out why it prompted me to pay when it should have been a free cast.
I was on PC, and I have a screenshot of the result, but I didn't think to take a screenshot of the prompt to pay. I'm not sure how to get a full game log, but there is a screenshot of the actions I took on that turn from an app I use as well.
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[Deleted User] commented
Thalia taxes noncreatures spells, and that tax is not included in the "without paying the mana cost", because it isn't part of the mana cost.