I might be overthinking things, but I just wanted to clarify I understand personal opinion, but the fact that you opt to use infect but at the same time choose to criticize and even disapprove of the use of Infinite combos is just downright nonsense. I'm not trying to insult you as a person or player, I just think that your opinion doesn't seem to track. That aside, I want to be certain - is Infect/Toxic/Poison the mechanic you wish to use? I ask this because to use infect means you're going to likely have to delve into some much meaner spells to ensure the table can't succeed in it's eventual call to arms against you.

Venum,

In regards to your manabase, you still haven't answered what your budget is looking like. A manabase tends to be the most expensive (and important) part of any EDH deck. Does your playgroup allow proxies?

Side tangent - the upcoming set Edge of Eternities has recently teased the return of shock lands. Shock Lands are some of, if not the best lands in modern magic. With this upcoming reprint they will be more accessible than ever so I highly recommend you get them their prices lower, namely: Watery Grave, Breeding Pool, Godless Shrine, Hallowed Fountain, Overgrown Tomb and Temple Garden.

You slightly misunderstood what I meant when I asked about your meta. Do you use the bracket system that was introduced by Wizards? Using that to describe your deck (or the one you wish to build) will make this process go over much more smoothly. Seeing that your Meta includes the infamous likes of Najeela, the Blade-Blossom and Yuriko, the Tiger's ShadowGC you are facing some very strong commanders that would likely have decks that would place them in Bracket 4 (using the aforementioned bracket system as a reference). But, and a very big but here - it depends on what kind of decks these commanders helm. Do they have big expensive manabases with lots of (monetary) expensive interaction cards? e.g. Mana Drain, Force of WillGC, Mana VaultGC

It seems here that you have a misunderstanding of infinite combos. The aforementioned combo of Thassa's OracleGC and Demonic Consultation are used almost exclusively in the alternate format known as Competitive EDH or cEDH. That is an essential combo for the format, and is expected to be part of a deck running . To you that may look like someone who just doesn't want to engage with other players - but to those who wield the combo in a game where other players are using similar strategies this is what everyone signed up for. Infinite combos are a staple of Magic and Commander. I understand that you are a person and you are absolutely entitled to your opinion. But please, have consistent logic here: Infinite Combos may be unpopular to some players, but for the love of Father Yawgmoth Poison is a FAR less popular mechanic in Commander.

Not saying you shouldn't use it - I for one embrace it. But using Poison will give you a distinct political disadvantage at just about every single table you show up to. Once the other players know, they will more than likely work together to tear apart your boardstate and shove you off the table.

It appears you are in need of some help with your manabase, well what would helpful is your budget. How much are you looking to spend, and what exactly is your goal? Do you want more functionality? (e.g. Modal Double Faced Cards (MDFC) more consistent access to GWBU? Do you tend to lean toward one color?

You say you're open to making your deck bracket 4, so I must ask - what is your meta? What kind of decks do you want this to go up against? Are you committed to bracket 4? It can be expensive if you don't want to proxy. What is your vision for this deck?

I understand not wanting to run Infinite combos if it's not part of your vision, but I do take slight umbrage with the attitude of "not playing the game to actually play" when using an infinite combo to close the game. I think that take is very strange coming from someone who wishes to run Poison counters ala Toxic/Infect.