Drana's Emissary and Recumbent Bliss fit right in

Wound Reflection (maybe)

Vampiric Link or Spirit Link (these do not rely on combat damage and can be placed on opponents creatures if need be) Spirit Loop (only your creatures)...

I would consider dropping the infect sub-theme and going full life gain/drain unless you go full on infect (an unpopular choice).

Aetherflux Reservoir should be hilarious

Thanks for the suggestions. I really like the idea of both Link cards, playing them on my opponents' fatties. Drana's Emissary is exactly the sort of creature I'd like to slot in instead of the infect weenies. I'll keep Skittles, if only because he's a threat (and a distraction). Wound Reflection is amazing and I absolutely want it. Aetherflux Reservoir I wanted, but didn't pull one during Kaladesh. It's on the list, though.

Thanks for the comment!

Vizkopa Guildmage is pretty awesome. You have Sanguine Bond already, why not go for Exquisite Blood? I know it's a little pricey, but it is an infinite combo. Also, Children of Korlis has saved my rear end a couple times by undoing all the progress my opponent made with a big hit, especially those Saskia players. If you pair it with the Vizkopa, you can turn your misfortune into your gain.

no Necropotence?

Aetherflux Reservoir might do well here

Exquisite Blood would be an outstanding addition to this deck. With Sanguine Bond out it goes infinite.

You should also consider Cliffhaven Vampire.