I’m pretty sure that Extort should be good. It looks good, like all good water-wings. And like all good water-wings, they won’t save you forever, so you better make sure you have a plan for getting out of the water when things are starting to get desperate.
I’m a heartless bastard at times, so I decided to focus on this particular pairing:
With that in mind, it’s time to make a decklist!
Main:
4 Exquisite Blood
4 Vizkopa Guildmage
4 Blind Obedience
4 Crypt Ghast
2 Treasury Thrull
2 Alms Beast
4 Syndic of Tithes
4 Gift of Orzhova
4 Orzhov Charm
4 Sign in Blood
10 Swamp
10 Plains
4 Orzhov Guildgate
Sideboard:
4 One Thousand Lashes
3 Immortal Servitude
4 High Priest of Penance
4 Oblivion Ring
The Goal:
It’s deceptively simple: Survive long enough to get Exquisite Blood and Vizkopa Guildmage in play together. Drop your 1WB into the Guildmage’s second ability, then trigger a lifegain.
The lifegain options are essentially:
- Extort any spell
- Sign in Blood on your opponent
- Attack with lifelink
If your opponent sideboards, then it’s possible they have some emergency Enchantment-destruction lurking around, in which case it’s time to go full-on Extort. Side in the High Priests to give them serious pause for thought about attacking. Get O-Rings and One Thousand Lashes in. Throw out your big beasts and the Gift of Orzhova. Give them so many Enchantments to waste Naturalizes on that sooner or later they run out, all while you Extort to death.
That’s the logic, anyway. Now I need to test this puppy out!
Troo Grit 
Hmmm you give a creature lifelink and your opponent loses 1 health, exquisite blood means you gain that much life a second time? but then you have gained life so your opponent loses that much life all over again triggering the first effect again? this seems like a vicious little circle to me….. lose 1 life costs you game!
Even better, it doesn’t matter whether your opponent blocks: You have lifelink, which triggers your Vizkopa Guildmage (because you remembered to spend 1BW to activate his ability). So you gain life, the Guildmage makes your opponent lose life, which then triggers Exquisite Blood. And onward into the loop.
Tasty, tasty victory 😀
sounds horribly broken
Nah. If your opponent has anything to get rid of Enchantments, Creatures, or Permanents, your strategy fizzles. No deck is unbeatable.