Absolutely insane last promo game to platinum.
i've been in plat promos 4 times in the last month finally got it with the craziest game I've had in 8 years of playing.
Storytime!
Our team:

Their Team:

We get pooped on early game. 0-8 bot lane, 0-5 mid lane. 2-4 top, and 3-1 jungle. Things were looking grim. Enemy pushed us to inhibs with no towers at like 22 minutes. They grabbed baron. We turtle hardcore and ward our jungle with all the pinks the shop could offer. They grabbed Elder. We turtle through elder dragon. We caught their shaco as he was trying to backdoor. Then we won a teamfight. they got a second baron. We turtled through that for another 5 minutes. They shoved hard through our bot/mid inhibs, We pushed back. Double-aced (both teams dead.) Then we fought over the last baron, We lost the fight. 3 members survived and held the nexus up just with just a couple auto's worth of health. The rest of us spawned.. We had one last major teamfight in jungle.. Almost everyone died. 2 of our guys survived. Jhin and Jax. One of their guys, Rumble. Jax teleported into their base, pushed down 2 towers, and a nexus, while jhin spammed his w on the retreating rumble who was trying to recall in every bush in our jungle. We finally won the game at the 45 minute mark. We absolutely got DESTROYED early game. We had NO foreseeable way to win. We never had a gold advantage. Our MMR was lower. Our enemies were fed.
Don't. Give. Up. Games.
Promo card: https://i.gyazo.com/ef34845eeaf053f22abdfac71d18e83e.jpg
Stats: https://i.gyazo.com/061c26dbdf3a60b9ecee6e6c586bfa43.png
Gold Lead/Kill Map: https://i.gyazo.com/f3252ce197eac421ae0963ef469b2501.png