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Sweet, edit added!

I think the OM requirement was two-fold; so they wouldn't be too powerful with/dependent on Pinhead and also so folks are only encouraged to run one or two (since more would really stretch all those OMs). Also in the lore, I think it requires a lot of energy for them to portal so it makes sense that's the main thing/event happening on that turn.
But if people would wanna see it changed, I'm not entirely opposed.