#1 Remove the Eldrazi that shufle back into your deck #2 Add a draw mechanism. Black reanimator runs into a constant problem of not drawing into what it needs early game and hen fizzles. #3 Add some search, such as vampiric tutor #4 Remove Dread Return, as you will never want to sack 3 big meanies for 1 big meanie. Dread Return is used for token reanimator decks, or decks where you can get a bunch of weenies out fast. #5 Take a look at the broken card: Kokusho, The Evening Star. It ads longevity to the deck #6 Necromancy is another card you ay wantto take a look at. This one depends on your persnal opinion, but I would say run 1 or 2 and take out 1 of each of your current reanimators. Reason being this card lets you reanimate at instant speed, which can be VERY usefull Hope this feedback helps.
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I would suggest running 4x Dakmor Salvage. Since there is a chance your lands will hit the graveyard. Not to mention this seems very similar to the dredge deck, minus the dredge effect.
For those of you saying this is an expensive deck for casual, I find you to be completely wrong. For most players that have been around for a while, this is a relatively cheep casual deck. Not to mention you are all assuming he is straight up buying everything. The price of this deck is nothing compared to many of the casual multilayer decks built at many of the places I play it. Now about the deck: It is a good deck, just a little slow. Another suggestion is adding Prismatic Omen. It would make getting the colors you need much easier, and is often run in 5 color decks.
I looked at Blood Tithe, and i liked it, I just would rather play something like Exsanguinate over it, since I have a bit more control of how much damage is done. And I find Syphon Soul to be faster. I would run bloodchief ascension, but usually, in a multilayer game, if that hits the board you almost automatically become the target. The idea of the deck was to deal damage evenly to all opponents, at all times. In a sense a "fair" multilayer deck that does not specifically target people. @ Zanmor: Multiplayer is a slower format, and is all about psychology and strategy. You could have the best most Overpowered deck, and still lose in multiplayer. (With the exception of first or zero turn win decks)