Buffs...? Buffs to the champion that builds a shit ton of defenses, that deals shit tons of damage with no offensive items or nukes people with a Void Staff, and that becomes practically unkillable even against Grievous Wounds??
Being at 1,200 health (50% hp with 2,400 total health) and with only 100 AP at level 18: Vlad will heal for 453.75 health with Spirit Visage. This gets brought down to a "mere" 272.25 health if he's affected by Grievous Wounds. For an ADC to match that amount of healing, they'd need to have 400 AD + crits, which requires them to be full glass cannons that will die to one combo from Vlad. Meanwhile, he's a tank with low cooldowns and high base damage. Guess who wins the trade 99.9% of the time.
There is literally no amount of counterplay that you can add to Vlad's current kit that will make him fair to play against, let alone how absurd he'll be if you make him even stronger at the same time. You're not doing anything to disprove my assumption that the entire balance team A) doesn't actually play the game and B) regularly indulges in heavy drug use.
If you want a champion that heals for days, he can't do damage.
If you want a champion to do tons of damage, he can't be a raid boss.
If you want a champion to somehow walk a line between those two roles, then he needs very distinct periods of weakness and a gameplay pattern that actually allows opponents to make use of it.