I think I have actually gotten this deck viable. The splash of blue might seem like a bit risky or unnecessary but after playtesting it has actually helped pretty consistently with my win con.
So basically the way this deck works is it throws out deathtouch creatures to keep your opponents creatures at bay, until you can pop vraska's -7 + unblockable for the win.
It wound up being pretty heavily based on Madnote's Vraska's Touch deck but with some personal touches for modern.
I believe that my mana is good as it is now. I'm not having much trouble playing my cards when I need to, even managing to get that splash of blue is pretty consistent. Rogue's Passage is a safety net if I somehow manage to not pull a blue mana, darksteel ingot or an artful dodge.
3x Vraska the Unseen and 3x Diabolic Tutor get me my win con every game.
Go for the Throat was a no brainer for removal. I need a good sideboard for it though. Duress was another good choice since it allows for easy disrupt but doesn't make me go broke (looking at you Thoughtseize). Fog keeps my vraska safe late game if I don't have any blockers up or they manage to get around them.
The Deathtouch creatures I have added are solid,
Deadly Recluse
and Wasteland Viper are not hard to get out early game and can survive hit from 1/1 creatures making them effective blockers without them needing to sacrifice themselves.
The Royal Assassin was added since I like his ability to take out attacking creatures before they even make contact, making him more effective than Deathtouch in my opinion. His mana cost gets a little iffy sometimes but he has been mostly effective so far.
Darksteel Ingot is good for slight mana ramp as well as getting that elusive blue mana i need for my win con.
