Which is the rarest spray in Fortnite Battle Royale?

In the game Fortnite Battle Royale you can talk about walls and floors since the 4th season graffiti.

Usually you get such sprays in the battle passes of individual seasons.

But when I got an exclusive spray at Gamescom 2018, I also heard that there was one more for E3 and one for Walmart.

My question now is if you can call this single spray rare.

I'm happy about every answer

There are many rare sprays. In my opinion, the Galaxy spray is rare.

I have not heard of that yet

This is a spray that you get when you buy a Fortnite phone case for the Samsung Galaxy Note9.

OK