Yeah last season something similar happened to me. Literally THE LAST FUCKING DAY OF THE SEASON, I'm in my gold promos after maining Sona support with a ~70% WR, I win one, lose one, so I steel myself mentally to play the most solid game of my league career when I get:
- Aatrox mid main (ACTUAL 10% WR LIKE HOW IS THAT EVEN POSSIBLE)
- Olaf Who's somehow unranked and quite literally playing his first ranked game of the season
- Adc Cait who cant CS for shit, I had to attempt to explain Sona's kit to because she said shes never laned with one before. (Somehow claims to main ADC)
Whole enemy team is Gold I - III (I had high ass mmr)
The only normal one in that game was the Kha jungle and even then, the two of us cant play what is essentially a 3 v 5. I've seen some crazy shit in my promos but that was my first time ever losing one due to actual rigged matchmaking. Promos matchmaking is so hit or miss its nuts. Sometimes the games feel normal and they're a breeze. Other times, you get Potato VI teammates who you swear are playing league with their monitor turned off and Challenger 1400LP godlike enemies, and just you're left feeling cheated.