Passive too good to also outmatch Raynor's biggest perk, so I'd drop the range bonus. Otherwise, looks solid enough

No escapes. No initiations, either. Burst of Speed would be the only talent anyone would take at 13 because of this. It also feels like stealth is inherently bursty and this won't allow for it. Needing to build up charges seems to run counter to how Zeratul and Nova play, both being ambushers relying on front load damage and a slow to pursue.

1. He's meant to be a different kind of support. Tassadar can't exactly solo support, either, given the shield's cooldown and limitations for example. As well, there is a lot of power that can come from those auras. Not every support needs to be there primarily to just heal the team, not everyone needs to be Lili or Malfurion or Uther. Holy bolt is meant to have a dual purpose and keep the front line moving with the ability to have control over it in the right situations. The Paladin is...

1. An interesting observation, though I would also remind you that Holy Shield offers its own kind of protection and in a fairly unique way. In a team fight, while impacts may be difficult to get off, the bulk of the healing would rely on the explosion. Lingering Light would offer a fair amount of extra healing and damage both. Of all current supports, the D2 Paladin would certainly be potentially more offensive than Kharazim. His heal, for maximum efficiency, would certainly be a higher...

I like it. Your Z is confusing though, he goes blind while using it...? or does he just not reveal his vision to friendlies? Veiled Threat, I think, would be better used to make it seem a merc camp or boss was claimed but wasn't. Unless an enemy hero sees the camp or attacks at least one of the created illusions, the enemy team will see the camp move on the minimap and the camp showing as claimed. Level 20 could allow the illusions to cause 25% of their damage and allow use on a boss...

"Target Marked" makes no sense, give it a re-read and revise what you mean, a ST attack making basics AOE? Huh? "Portable Stealth Field" sounds like it needs a rework compared to the current description, maybe just holo decoy the nearest friendly hero to the decoy placement? Or do you mean it should cloak the ally, as well? Making a ground target into a player target wouldn't work very well. Holos would need to fade to stealth when they stand to fire/attack, too, if...

Overall looks a bit too similar to Sonya. Might want to go back to the drawing board to make him more unique. Q, E, and Bladestorm share Sonya's skills too closely. The "Drink" heroic has potential.

Iron Maiden would become overpowered if talented. VERY overpowered. One skill on that short of a cooldown doing that much is simply way too good. I had worked on a Necro concept on a whim and noticed your concept after making and posting it. I sincerely believe the only way to make the curses useful without making them overpowered would be for them to be actives as talents. I'm also not sure, between Poison Nova being thematically PBAoE and the passive being a temp summon on minion...