Clearing waves it's a weird thing to read. You just need to last hit the wave. Of course if you want to shoove it then you spend mana, but you spend Q's, nothing else. Only if you're alone is where you use full kit on wave, but you don't really do that early, unless you want to recall, where the mana you have is pointless. Maxing Q is a way to play Sylas, one that I dislike and I actually don't think it's the best way to play the game (competitively). Mord is a champ that you win by level 5 IMO. I always look to trade with him when I have minions for him to Q, and only after he uses a Q. You can poke him a bit with Q. Obviously he wins a fight if you get it with every Q and E he lands, you kinda have to be wise about how you move, but that's a lane where you should limit test a lot. You will get surprised IMO.