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So, what you're saying is, one Mind Control and I win against this deck

I don't think you need an expensive mana base. For one, it's supposed to be a casual, fun format. You can have a lot of fun and drop your WUBRG general only a turn later than usual most of the time with proper fixing, maybe even sooner with ramp. My playgroup has a lot of legacy players, but even with their dual lands I can hang. For example, running Erebos, I'll win at least 1/4 with a deck that cost less than $100(that's very cheap in the Magic realm). Could that deck use a $30 Urborg? Probably, but it's 1/99 and most of the time won't even notice.
Heck, my friend who runs decks like Jeleva only spends about $40 on his, and wins a fair share. The funny part about playing against $20+ creatures is that most of them die to Doom Blade, or are just as powerful on your side with Mind Control, both cheap uncommons.

If you think you need to spend $400 or more on a deck, you might want to rethink your deck. Besides, what are you up to win with that expensive deck? $20 dealer credit at an Open event? If you really want to play that deck, go on Cockatrice, where everyone's playing $200 Mana Crypts.

[Trade Binder]

Trade Binder

Needed

3x {Demon of Death's Gate} [m11]
4x {Kira, Great Glass-Spinner} [bok]
4x {Phyrexian Crusader} [mbs]
4x {Shimatsu the Bloodcloaked} [chk]
3x {Throwing Knife} [ori]

Counterlash maybe?

Here

For me, {Humility} and {Winter Orb} are two card that I despise seeing in games.

Yeah, for me it's anything that brings a game to a near standstill. Humility doesn't do anything except buy its caster time to find his stupid combo. Sometimes I hate Chaos cards too, because cards like Possibility Storm make turns last too long.

40 creatures is insane for any EDH deck short of Animar, maybe Zegana. I'm just going to assume that's because your meta favors huge creatures over board wipes. If that's the case, I'll at least point you in the right direction by saying you're missing a way to one-shot people. For instance, I use cards like Three Dreams to find the combo of Auramancer's Guise, Battle Mastery, and Spirit Mantle. 21 commander damage should be a thing in any play group of you ask me.

If we're calling Tranquility effects board wipes, then throw Paraselene on the list.

Also maybe worth mentioning are silly combos, such as Mikaeus the Unhallowed + Woodfall Primus + Ashnod's Altar(substitute any free repeatable sac outlet here).