[Modern] B/W vampire lifegain/attack

[xena_star]

vampire ally

[Curstdragon]

One suggestion if it's an option, replace the Bloodbond Vampire with Bloodthirsty Aerialist. It does the same thing but for a mana cheaper and has flying.

[eomereolsson]

I just posted this in another thread, but my appeal to just never play Murder in modern also applys here:

To add to the above points you should really never run Murder in a modern deck. The most common black removal spells in modertn are Fatal Push and Dismember. Mana efficency is key. For this reason you also sometimes see Cut Down crop up, though I personally dislike it as it can't kill an online Dragon's Rage Channeler.
Though Fatal Push needs Fetch Lands like Marsh Flats or similar to reliably enable Revolt. If these are not available for budget reasons, there are still plenty of two mana removal spells. At the cost of two life Infernal Grasp kills anything. That's the one I'd recommend. Otherwise there is great amount of two mana removal that kills a lot but not everything like Shriekmaw (two mana only if evoked, but extra value if you draw it late in the game), Doom Blade, Go for the Throat, Cast Down, Power Word Kill, ...
Lastly for three mana there is Hero's Downfall which is just strictly superior to Murder and since it was recently reprinted at uncommon really not much strain on the budget. Not strictly better than Hero's Downfall but in my opinion still superior to it is the Swift End half of Murderous Rider.
Though to reiterate, mana efficancy is key, so I'd run at most two 3 Mana removal spells and the rest for less mana.