Etali, Primal Conqueror lets you cast FIN adventure lands in addition to exiled spells.
When Etali is exiling cards, if one of the adventure lands from FIN is among the lands exiled, the interface lets you cast the spell side in addition to the exiled spells, even though Etali only lets you cast spells from NONLAND cards exiled.
The Main Event#41164
shared this idea
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Murdoctor#39989
commented
I believe this is technically correct behavior and not a bug, since Etali will exile cards until it exiles a nonland card. The adventure lands are technically both nonland and land cards, depending on how you decide to interact with them. When it gets exiled, it's considered to be a land card so the ability keeps exiling more cards; however, when you attempt to cast the adventure from exile, the adventure land is then considered to be a nonland card and it's allowed by Etali's ability. It's weird and not very intuitive; there are some videos online that explain it in more detail.