What decks would become OP if we had unlimited mosnter zones?

So I was talking with a friend of mine about Magic the Gathering and, apparently, there are no field slots/restrictions there. And thus, I thought about how many times I had to end my combos early because of only having 5 slots for monsters.

My entries would be:

All pendulum swarm decks (Igknights most notably)

Most decks which use T'Zolkin (Dragunities Dux+Phalanx Dragon decks / Sylvans)

Mermails? Frightfurs and DDDs? And maybe geargiakuris.

What do you think?

And may god bless my typos