What is the gold square mean when combining cards?

Words
83
Reading
1 min
Listen
Play
4y

I notice that when I combine cards on peakmonsters@peakmonsters that there is a Gold outline around one of the levels.

The gold square is not related to the highest level that I can combine cards. And it is on different levels, depending on the card that I am combining. Any clue what the gold outline square means? 


This question was created on reverio.io, Reverio is a question and answer platform built exclusively for Hive. Answer this question on Reverio by clicking here.

What is the gold square mean when combining cards? | Ecency