How about Spell Ruptures for control? It would be great control with the Chimera and Cyclops (especially since I believe the act of casting it will boost the cylcops' power).
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Haha mostly because I am cheap.
Also if you want to have some fun, throw in a Predator Ooze. Just do the same strategy as the Slaver, but he will just keep getting bigger.
I'm pretty sure I just found a way to break Dreaded Slaver. Ulvenwald Tracker says it you can have target creature fight any creature (including your own). Have it fight something like Polluted Dead, becasue it doesn't say only your opponents creatures come back. So in other words, you have ti kill Polluted Dead, and then it comes right back, blowing up an opponent's land, and you can repeat the process.
I have a couple recommendations, but I already posted them on your comment on mederski88's spirit deck. So it would be a little redundant to copy and paste.
Oh yeah, and I forgot about Kataki, War's Wage. This card makes all artifacts on the field have "At the beginning of your upkeep, sacrifice this artifact unless you pay 1 mana". This just really can screw over a lot of artifact decks.
Also a great strategy for Geist of Saint Traft would be to use this enchantment: Steel of the Godhead - 3 mana (one white/blue and two colorless) - Enchant Creature - As long as enchanted creature is white, it gets +1/+1 and has lifelink. - As long as enchanted creature is blue, it gets +1/+1 and is unblockable. And the best part is if the creature is both colors, it gets both effects. So in otherwords he becomes a 4/4 with hexproof, lifelink, and is unblockable. Not to mention a 4/4 angel comes along as well (though she can still be blocked).
Ahh spirits, one of my favorite things. I have a spirit deck I am working on myself and have a couple Kamigawa cards I would recommend. Shape Stealer - This is a pretty good deterrent for a two drop (granted it is to blue mana). Whenever it blocks or becomes blocked it matches the opponents creatures power and toughness, and with Drogskol Captian it equals there stats +1, which means if they don't have deathtouch you can have a beastly killer. Nikko-Onna - This is a thee drop white spirit with a 2/2. What is special about her is that when she is put onto the field you destroy target enchantment, and whenever you play another spirit spell you can return her to your hand. A great way to have a reusable destroy enchantment for 3 mana. Callow Jushi - This is a card that is a three mana (two blue and a colorless) human that changes into a legendary spirit. When every you play a spirit spell you may put a ki counter on her. Once you have two or mor you flip her and then you can have the ability to remove those counters to counter spells (unless the controller pays 2 mana). It is like a minor version of mana leak that you can hold onto, and proliferate if you wish (it lacks the surprise factor though). Æther Shockwave - A four drop, white instant. "Chose one - Tape all Spirits; or tap all non-Spirit creatures". Cast this on their turn right before their attack phase and they are a sitting duck.
I like this, I was running a black/white human/demon deck and this has some good ideas I could use. Although I have a couple ideas that could help your deck: It might be better to only put two Elgaud Inquisitors in it, they are decent but you could put in another Thraben Doomsayer or Champion of the Parish. Mausoleum Guards would also be a good idea becasue they cost just as much as the Inquisitor but you take out the life link and get two Spirit Tokens instead. I would also recommend Intangible Virtue instead of Honor of the Pure, it might only be the Spirit Tokens that would get a +1/+1, but they would also get vigilance which means you can attack with them and then put them on defense next turn. Although if you really want to make a relentless deck I would recommend Twilight Drover.
Also Chalice of Life (Chalice of Death) could also be a good card since there is a healing factor with this deck.
This can seem a little fun, although some other card combos that might be interesting in here: - Palace Guards + Darksteel Plate = Indestructible Defense - Curse of the Nightly Hunt + Norn's Annex = Opponent loses 2 health for each creature they control or waste white mana. Although those are combos so they might be harder to pull of then what you have.
Livewire Lash would be really good in an infect deck. Haha although it might be a little slow for my strategy. I've been debating on taking out the Inquisitor Flails as is, I consider it to be "too slow". My mentality with it is "Why should I pay mana?". Mutagenic Growth and Invigorate help me around this issue. Plus with Groundswell I can get a +4/4 for one mana as long as I put down a land that turn. The main issue with this strategy though is that it is a gamble, if I don't pull a good starting hand or get countered it could be very costly.
Hahaha that is pretty evil with the Blightsteel Colossus strategy. Also that Priests of Norn with Twisted Image is clever as well. Right now actually I am trying to work on a Green/Blue Aggro Infect deck. No clue how well it will work, but if I get the right cards out I can hopefully kill between turns 2-5.