can't use instant with the starting town land during opponent's turn
During a game of ranked standard, I had a starting town and 2 white lands (starting verge). While I had a blue instant in my hand (Consult the Star Charts), I wasn't able to cast it during the opponent's turn. Even when I added a stop to their end step, tapped starting town for blue mana and had the available mana to cast it, I still wasn't able to cast my instant. In the screenshot, you can see I have the available mana to cast an instant spell in my hand, but could not cast it. This was when I had priority as well, before passing to my turn.
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SeñorSwiper#93906
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Muggle_of_the_Coast#19144
commented
Your screenshot was cropped, but did opponent by chance have Voice of Victory on their side of the battlefield? That would cause you to be unable to cast any instants.