Profet93: Perhaps I'm a bit biased as it's a pet card that's been in the deck since its conception, not to mention I'm a sucker for the "Evil Magic Book" trope, but yes, you're absolutely correct that it's not the fastest card in the deck.

Racing toward the big reanimation ability is definitely not my Plan A. With such a low creature count, it's rare that I get more than one study counter, anyway (yes I can discard other cards, but creatures are what I want to be pitching). I definitely don't count on it for my main path to victory, as my Entombs and Buried Alives usually get me there quick enough, but it is nice to have a long-game repeatable aid / redundancy to Fauna Shaman and Survival.

There's probably better or more efficient cards that fulfill that purpose, I just never bothered to look! =P

Tinnuki

A good friend of mine also had that as a pet card. I suppose the "evil book" motif is quite alluring, especially for this monstrosity of a deck. You mention the deck plays like a combo deck at best. Can you elaborate as to what combo or "combo like" you have, perhaps I'm missing something obvious?

Springbloom Druid > Cultivate? Only because it's a creature and could work with ramunap. I do understand saccing a multi-color land is not ideal but just a thought to increase the creature count (and pitch for fauna shaman).

How often do you utilize Alchemist's Refuge? Would you not be better suited with a Yavimaya Hollow for additional protection as well as politics?

Lastly, thoughts on Mirri's Guile vs. Sensei's Divining Top? Guile requires no additional mana. Top however requires 1 additional, can be done at any time, can draw the card in a pinch (note mystical tutor/mill, although I doubt someone would want to mill you, usually lol), easier to cast in a 3 color deck and is much harder to remove. You already run Sylvan library so I'm unsure if the redundancy is needed, top or guile. Why not just add additional draw, interaction, tutors or whatever else you find you occasionally wish you had?

^ None of this is criticism (unsure how my tone comes across), just genuinely want to understand your card choices. I tried to make Mimeo as my first commander coming back after a decade and it failed spectacularly so I'd love your input on your thought process :)

Profet93: No worries!

My "combo" comment was just my shorthand way of saying that with a decent opening hand in an ideal game, it's possible to get the perfect two creatures into the grave early on, cast Mimeo, and 1-Hit KO a player each turn, barring any pesky interaction. I know it's not technically a combo by definition, it just feels like one to me!

To answer your questions:
Springbloom Druid is not one I considered, but I see the value with Ramunap. Chump block, or another sac target for Victimize is a benefit, too. Good suggestion, I like it!
Alchemist's Refuge doesn't really have a specific function, other than being a bit of extra utility for when I need it. Yavimaya Hollow is not a card I'm familiar with, but it's perfect. Another good suggestion.
Sensei's Divining Top is a good card, and I don't really have any reason for why I don't have one. Likewise, I don't have a specific reason for why I use Guile, other than the fact that I like the passive see-3 effect. Related point, extra draw is an area that can be improved, so I'll have to take all this into consideration.

As a general side note, none of my commander decks are completely optimized, 100% efficient machines. They're just piles of cards that I've toyed with and found a good arrangement that suits me. Anytime I'm asked "Why don't you run [card]?", saying "I never felt compelled to try it" feels like a lackluster answer =P

Tinnuki

I'm glad to see some of my suggestions are worth looking into. It's always worth proxying them first before spending the $, particularly with Yavimaya Hollow. I usually comment on decks with the goal to optimize them, I am in no way giving you a hard time for your choices, just wish to understand. Your response was anything but lackluster.

How has Fatesticher been for you? Aside from Fauna + Grimore, are they any other notable targets? Perhaps a Fierce Guardianship might be worth looking into given that you already run slaughter pact + pact of negation. Being able to bluff is strong.

Alternatively, given I am unaware of your meta and how much blue is rampant, Allosaurus Shepherd and Conqueror's Flail might be worth considering along with a Cavern of Souls. These repeatable sources of anti-blue might pull their weight in the right meta.

Another potential consideration is Skullclamp. Although you only have 3 creatures, it could be a deterrent to kill your commander or force their interaction pre-combat.

Some of these ideas are better than others.

Ultimately, I'm excited to see how this deck progresses.

Profet93: I understand, you're fine!

Fatestitcher is actually one of the newest additions to this deck, which I decided to try out after seeing it pop up in a couple top Mimeo decks. Gotta say, I'm less-than-impressed. While it is nice to get that extra activation, the couple times that I had him on the board, he didn't do much.
Fierce Guardianship is a card I can speak to, as I recently just picked one up but haven't found a spot for it yet. I'm very bad at picking what to swap out. The classic Cavern of Souls is awesome too, just never got around to trying it out.
I do like Allosaurus Shepherd as well, and I feel like he could fill the role of one of my Veils. Flail is another card that I'm not altogether familiar with, but it is interesting.
Conversely, while Skullclamp is a good card by itself, I'm really not feeling it here. Maybe I'm just overlooking the value.

I haven't really done major updates on this deck in a while, but now you have the gears turning.