How do you deal with heavy sustain champs at top lane?
I'm looking for any item builds, runes, or masteries that could help with this, especially for ap mages/champs.
Morellonomicon doesn't affect their health regen unless you've bursted them down to 40%. I could take ignite for the laning phase but then I lose teleport for the mid to late game. Some characters i've been having trouble with are Nasus and his passive, Graves with Death's Dance, Trundle, and Garen's passive.
All of them except for Graves tend to build tank and still deal high damage. In that case, I can build penetrations, kite, counter-build armor, whatever I have to do but they can still out-trade because they heal whatever damage they take right back.
camp your lane while also playing someone like
etc to be able to kill them and put them behind. Most of the champs that are hard to push out of lane fall off pretty hard if they even get a little behind. I generally can bully Nasus all game with
just to try to put a ton of weight on someone who does damage but also dies to people who are behind instead of the person who does damage and doesn't take that much damage while ahead.
. You get a 30% CD on your
right now. He plays well into lane bullies like
. His base damage is pretty massive once you know how to trade with your Passive, E, and Q.
That lets you build something like:

all offer decent size power spikes.
Is a odd one for you to bring up. Graves has no natural sustain, so really any champion that builds lifesteal first is suffering in damage or being tanky.
Is the same concept as nasus. If you pick a champion with no sustain and high costs, there is really nothing to do about that when someone picks up a high sustain champion. Play champions that can be very aggressive, so they do not have a chance to heal before they are dead.
Again, all about the champion pick. Focus on keeping his passive down, and make sure you didn't handicap yourself.
can be usefull as it denys his passive for an extra 3 sec with the dot.