Fights last a long time and it is too easy to make turtle teams that win by time outs, esp now that more ppl have access to legendary supports like gillian and mithrasa. I see more and more of these teams and they are tedious to fight.
I suggest an incremental damage boost on both sides, starting at half-time going up %15 every 30s. Defensive turtle teams still have a chance but it's much harder for them.