With my experience with meren your not doing it right unless your doing graveyard combo, also i feel like all you need for draw is skull clamp and haruspex cause when ever you put a card in your grave your basically drawing a card you dont really need a lot of straight up card draw with her i only use haruspex and skull clamp and i have been quite successful, and your should be running ashnods alter as well as alter of dimentia ashnods is too good not to run

Bro Callous Bloodmage is such an insane add and I didn't even know it existed I have been blessed by algorythm

I wasted all this time to see your wincon is an infinite combo. I should've realized this when you had like five tutors in your deck. Your "friends" should kick you out of their play group.

It's a cool deck, I really like it. I've been working on powering down my Meren deck a bit to fit a new playgroup. It's been a really fun process. I feel I do need to point out one little thing though, you need an extra step when it comes to the interaction between: Mikaeus, the Unhallowed + Walking Ballista. Walking Ballista is a "non-human" so Mikaeus will buff it so it DOESN'T die when you remove it's +1/+1 counter (it'll still be a 1/1 thanks to "Mike" - a 2/2 with the +1/+1 counter). It works great with one of your free sacrifice outlets (or with Blood Artist, et al. with Ballista "pinging" itself, etc.) but unfortunately requires that extra step to work as a combo.

Hey there! I’ve been playing Meren for years now and one card that I never see in most decks is Smuggler’s Copter. In my opinion, this is an absolute beast of a card in Meren. It can be crewed by any dork and will let you draw a card and discard a card. It gives you card advantage in Meren since the GY is an extension of Meren’s hand. It gives you a way to pitch a card in your hand to the graveyard so that you’ll be able to reanimate it.

I've had Meren as a commander until I took it apart. It was my favorite commander. I want to rebuild her because she's fun. I noticed you forgot to mention you need an infinite sac outlet for the Walking Ballista/Mikeaus The Unhallowed combo. Since Mikeaus gives Ballista undying and non humans +1+1 you will hit an opponent by removing a +1+1 counter. Ballista will still be alive with the +1+1(non counter) so you will have to sac Ballista to put it in the graveyard. Ballista comes back with the +1+1 counter from undying, so you repeat the process. This makes a 3 card combo and not a 2 card combo.