Accidentally clicked away from a message on the game

It said “5 games” in bold red and I accidentally clicked the screen before I could see what it was trying to say. Any ideas on what the game was trying to tell me?
The message popped up after I won an async match.

Play 5 async matches and unlock Arena iirc

Oh weird. Ive been able to play arena for a while now. Huh

It might be the thing that tells you that you’ve completed 5 games for the season and will get the first tier season rewards.