The True Damage song Giants has some really nice lyrical allusions to the champions being played.
I loved, for example, how ekko often brought up his rewind time manipulation through both his lyrics and how he was presented visually
The line in this thread's title especially stood out as something that applies to league as a whole. The theme of team based gameplay and working together.
Ekko expresses supreme confidence in both himself AND his teammates simultaneously.
In fact I've seen more than a few reactions where viewers pause the video there to praise its message