If your deck is trying to cast as many X spells as possible every turn, and wants X to be as much as possible, we probably want to prioritize ramp more highly than just 8 or 10 spells - in fact, I can see running 60 mana sources, like this Vaevictis Asmadi, the Dire deck
Regigigas has also given decks like Lugia more tools to combat high-HP Tera Pokmon, while Black Belts Training fixed math on several archetypes to score key knockouts
The card's slow speed and low splashability combine to make it a lackluster option for filling niche roles like dealing with Arclight Phoenix
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Its possible the correct number of Faceless Havens is one or two, but I doubt its right to play four in this version
If your play pod doesnt mind you playing Ersta, Friend to All, the planeswalker can help you win the game as your commander if you have 20 or more wizards on the battlefield