Of course. I don't mind explaining my thought process. I've had friends play goblin decks, merfolk, token decks, etc. Against decks that just jam out lots of creatures, Portcullis just shuts those down pretty hard. There really isn't a situation where Portcullis isn't useful except against decks that only have one or two creatures at a time on the battlefield. Chances are that someone in your play group will have lots of creatures in their deck and Portcullis is very cheap and effective.

Thanks everyone for 10K+ views and all of the upvotes! I appreciate everything!

After much thought and reflection, I have decided to no longer update existing decks or create new ones. This is due to the slap in the face that was Magic 30th Anniversary Edition and Mark Rosewater's statements when asked about product fatigue. I can no longer in good conscience continue to play magic or support its products as long as Wizards continues down this path. The community hates to see the game fall from grace as it has this past year. We are people that love magic and truly have a passion for it. To be treated as an endless money farm instead of decent people with a valuable opinion is unacceptable. I will no longer contribute to corporate greed from Hasbro and Wizards of the Coast. Consider me officially done with magic and I will wait and sell all of my cards when I can get the most money for them. What a sad time we live in.

Modern Horizons 3 gave you some potential new toys:

Amphibian Downpour mini Humility.

Necrodominance power at any cost.

Abstruse Appropriation removal theft.

No to Amphibian Downpour for sure. Necrodominance is nice but I can't use it here. It exiles cards that go into my graveyard which defeats the purpose of this deck. I LOVE Abstruse Appropriation. I will most likely add this. I also need to add Insatiable Avarice

My bad on Necrodominance. Anti-Null Brooch!

May I ask why such a hard no on Amphibian Downpour? This is cool design space. Humility is the global effect. Polymorphist's Jest is the silver bullet global effect. Amphibian Downpour is somewhere in between. You will always be playing it in response to a threat which gets neutered along with one other creature. That's the basic application. You run a bunch of 0, 1 and 2 mana spells a.k.a. perfect fodder for Storm debauchery. Or because of Flash in response to an opponents chain of spells.

Amphibian Downpour is single target only. That's why I wouldn't run it in this deck.