Haha yeah she would be an interesting addition, but I can't invest too much in any 1 card.
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Looks like a pretty interesting deck, however, I think I'd take out the Xathrid Gorgon & War Priest and trade em in for 2-3 Crypt Ghast, I think it would really take advantage of extort. And since you have a few kill spells and the Vampire Nighthawk w/ deathtouch, I'd suggest taking out Righteous Blow or Victim of Night & replacing w/ a couple Essence Harvest...which takes advantage of the boost you attacker gets from exalted to deal extra damage to you opponent and gives you more life.
Hey nice deck. I would probably put ghost quarter in your sideboard and just add in some basic lands. Also, I would take out the negates and add in a burn spell, maybe annihilating fire, so you can attack the player or their creatures directly. I like your creature choices, especially snapcaster and talrand. Perhaps an archaeomancer or charmbreaker devils (the latter is pretty costly but its an awesome card) could be included? But yeah, overall, you have an interesting deck. :-)
Kool deck, i like it. But some of those cards are a bit pricey lol. Ideally, I would add another demonic tutor, to increase the likelihood of either drawing spreading algae or being able to search for it. But it seems like a strong deck overall. Have you played/won with it?