maybe something like evolve's "story" mode. where depending on what side wins, the next match has a different buff/debuff for a certain side. only problem, you'd need to play a few games togther.
I'd like to see queues just for this, say you just won on a Morg team vs Kayle team, the next match you get a permenant aura of dark magic that does 1 true damage each second enemies are near, for just that match. if Kayle wins then there is a burn effect for 1 true damage each second for 5 seconds after each hit, non stacking.
or maybe like titanfall's story, where it doesnt change based on win/lose, but instead has a storyline a preset characters that you could follow. just as a fun thing to do, learn more of the lore, ect. and the teams can change each time then, you dont have to try and force the same teams trough it all. that would be long and tedious, and rough on those who want to just play one game as a time waster.