This behavior is inconsistent in the game and very frustrating. Sometimes, when you have 0 sigils to play some event, you can still see your team (manage, share, copy/paste), yet others you cannot.
In the worst case you click to see the team and get a “buy more sigils” announcement. Other times you click “play” and you get that same announcement. So first, please can we have consistency, and furthermore… why can’t I see the team?
I suggested to add team view at zero tokens for underspire a while ago. There have been cases in the past, when they changed this for some guild events, but it always took some nagging by the community.
The “consistent” part is, that new features are implemented without this option.
For Underspire, at least, if you still have a lantern you can see the team - just click the lantern as if you were going to use it, but don’t start the battle and it won’t get used. I know I’ve done that a few times to share my team even after I’ve used all my torches.