I watched your replay with Dazzle, since he's my fav hero, and I can say that I'm really good with him

First of all, you shouldn't start with ring of basilius, especially since you were laning with ursa, a guy that has vlads as a core item. Better start with headress if u wanna go full support, or ingredients for bracer if u dont want meka, or medallion if u wanna play carry Dazzle(really funny build

). Skill your heal at lvl 1, then one lvl of grave and then 3 lvls of poison touch, to have an early disable.At 6 get ulti, after that max your heal and then your other two skills. Only difference in poison lvl3 and lvl4 is its cooldown. U should know that what matters in Dazzle is posotioning, either when u heal, or when u use ulti. I saw enough times u letting teammates die because you waited too long to ulti, or u weren't near enough to grave them. When u use your heal, go to a position that will ensure that your enemies will take full damage from the dissipate. At mid game you should have Django, mana boots mekansm and start working on hex, for a support Dazzle. If u want to carry, grab medallion, armlet, treads and then shivas, linkens and skadi or desolator.