Ive been running a meren deck since i started playing magic and my current version is probably my favorite. I'm running 28 lands and a dryad arbor and a few ramp spells and a lot of card draw and ive been getting really good results with it.

so many great inclusions... Xiahou Dun?? hell yes

In my opinion I think you should reconsider adding Mazirek, Kraul Death Priest as it also works to combo off a creature with Persist + Sac outlet.

It's pretty much the same as Mikaeus, but that way you can have 2 creatures that you can use with that combo instead of just Mikaeus.

How has liliana heretical healer been working out in this deck? I'm continually torn on this card...

I am also working towards a 70 -80% optimized meren deck.

davester00123: Liliana is great mid to late game. Her ability to reanimate a creature, act as a discard outlet for me to reanimate, and gets recurred back if she bites the dust is pretty good. There are indeed times where she is mediocre and times where she shined. I would suggesting testing her for a couple of games.

http://tappedout.net/mtg-decks/meren-semi-competitive-1/

here is my version. I don't have the funds for the super efficient mana base but it's decent enough. Let me know what you think.