Just finished the 7.1 objectives in 7 for 7 quest. Will mostly do one chapter a day here on.

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My usual team was this for 7.1.1 to 7.1.5 with not much challenges:

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But 7.1.6 was fun for me, i took the path which expected XL champs for no glacing and ice phoenix as boss which needed coldsnap immunity so thankfully i had this team:

Sassy beat ice phoenix and rest did well on path. Terrax is L not XL but didn't use him anyways. So was happy that such combination was possible with my 7* roster.
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Comment any such unique teams apart from your go to team that challenged diversity of your 7* roster and best suited for a particular path and you were thankful to have them as 7*. I think that was the point of 7 for 7 to challenge the diversity of 7* roster.