Nah don't use foundation items,they are overrated.I guess by anty you mean QA(?),if you do then it's really importand,you should buy one.Now everything else is pure luck if you're playing one on one with the same class as you and of course timing,always use ud a little bit after he does,that gives you a big step ahead,keep shield of faith for when you're around 4-5k hp,Always before you get in a fight make sure you have pain of shillien on,so that you can get sos and walk out of the fight alive and like a boss since with that drain,you might get out of it with full hp.Finally make sure you have the right subclasses(Barrier,Counter Spirit,Haste/Critical Chance/Master Critical).