Yeah, it's another reanimator deck.  The focus on this one is consistency.  It's done me very well with a winrate of over 60%.  This deck has multiple answers to multiple threats in the current meta and just feasts in BO1.

So if you want a fun deck that is extremely consistant, please consider this.  Thanks for reading! :)

Wincons

Stealing your opponents big threats with Agent of Treachery and using it against them, using Lotleth Giant to go face, or decking yourself with Jace, Wielder of Mysteries on the board.  

Gameplan

Early (T1-3):  Get creatures out.  1 or 2 is fine (avoid getting boardwiped).  Use Stitcher's Supplier, Chart a Course, and Tomebound Lich to populate your graveyard.  The Lich, in particular, is a great blocker and stalls out your opponent from going full aggro on you.  Always try to get 1-2 x/1 creatures out to help your Massacre Girl wipe if you come up against small aggro.  Tyrant's Scorn is good for spot removal in the early turns.

Mid (T4-5):  Use Blood for Bones and/or Connive // Concoct to reanimate your big boys as apporpirate. 

Usually that's going to be Agent of Treachery to take a big creature/planeswalker...but if you're feeling greedy, take their lands to handicap them out of a color.  If they have a bunch of creatures, set it up so that Massacre Girl can wipe the board. 

Remember, Quasiduplicate is just plain evil when you target your Agent of Treachery!  And the discard payment for casting it from the graveyard is beneficial for us. 

Don't forget, if you cast Blood for Bones and sacrifice an Agent of Treachery, you can select the sacrificed card as the reanimated card!


Late (T6+):  More often that not, opponents will fold when you've stolen all their good stuff.  But sometimes you'll need to re-animate your Lotleth Giant and maybe Quasiduplicate once or twice to really hammer in the damage. 

Sometimes opponents try to 'deck' me when I have 5 cards left in my library.  Little do they know that I can likely drop them down from 20 with a well timed pair of Lotleth Giant.

Tyrant's Scorn is good here for picking up a creature you own at the end of an opponent's turn so you can recast it during your turn.

Really...just end it by casting Lotleth Giant, smashing face, and reanimating/duplicating it for funsies.

Sideboard?

To be honest, it's mostly there for fun.  Since Mastermind's Acquisition is there as a one of, it rarely comes into play.  I don't mind pitching it to a Chart a Course if it helps my overall goal early in the game. 

Feel free to populate it with whatever you think is clever.  Or replace it entirely if you don't want to bother.  Just put in a Fblthp, the Lost or something.

Conclusion

This is a really fun T1.5-T2.0 deck to play.  There's a certain thrill to casting a blind Connive // Concoct and hitting your taget (Agent or Girl).  I've played this deck for awhile and used to run some other cards that are common in Dimir reanimator decks, so I'll discuss notable exclusions:

Fblthp, the Lost I hated when I had one on the board and another in hand.  

Thought Erasure We already have too many 2 drops and counterspells aren't as common as they once were

Scholar of the Ages Good for late game, but we are looking to end games, not continue them

Augur of Bolas Feels bad when you miss any instant/sorceries and you see a card you want to reanimate and are forced to bottom it.

Wall of Lost Thoughts It's either this or Dusk Legion Zealot for a 2-drop.  It gets a ton of cards in the graveyard and it handles small aggro pretty well.  However it hurts Massacre Girl and runs into the same problem Stitcher's Supplier does, which is occasionally it mills our reanimation cards.  I've tried this deck with both and prefer the Dusk Legion Zealot just to make our deck heavier towards black than blue for the sake of the mana base.  But I'm not sure if it's the right call to be honest.