So hear me out...I found something out by accident. I kinda want to try it out in ranked games, but I'm not sure how viable it is. It involve psychology.
Blitzcrank is perfect for this though. To note, I had the most assists.
Steps:
1. Die to towers/dragon in the beginning of the game, preferably at level 1 or 2, this will make the other team think you are a free kill (deceive them)
2. Roam around randomly dying to red/blue buff or baron or dragon, or towers (this will make them think you are a joke)
3. Run into all of the enemy lanes at least once giving the enemy 3 free kills...this will make them want to chase you knowing you are a free kill
4. Start playing a little more serious, but make sure to die randomly from towers etc every once in awhile to make them question your credibility. Start chasing them and luring them to die by your team by having perfect pulls (they will chase you after the first 3 steps, don't worry)
5. Start placing wards all over their base and jungle. Continue to die from baron solo'ing etc and give the enemy some kills if you want. But most of the time...lure them in, and reel them in with your q. They will do this thinking they can get free kills. By this time, it doesn't matter if you die, you are worth nothing. The key is to never kill enemy champions (if you will notice i messed up once at the end on this game), let your team kill them)
6. Blitzcrank does not really need many items to be effective at this, you should have maybe a frozen heart by the end of the game. Do not farm minions.
7. By the time the enemy team gets smart, from dying over and over from being baited, it will be too late, and you will actually have enough assists to do something.
8. Your team won't report you anymore, because you will have won the game, and the other team will commit suicide.
This is what happened that game...wondering if anyone can replicate my results. I got 2 of my team members super fed doing this...always out of sight. Pretending like i was going to die on purpose. Then I'd start to run with 1/3'd health and bait them perfectly by knocking them up, or pulling them.