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This alone would honestly be enough to account for the General Tazri MTG price spike

The only proliferate card to be cube worthy is Contagion Clasp and thus not enough to base anything other than a few synergies on

When this land enters, return a land you control to its owner's hand

It is worth noting that if you play Possibility Storm into a stax piece like Boromir, Warden of the Tower, you'll effectively shut everyone but the player controlling Boromir from being able to resolve spells

An individual planar deck must be composed of at least 10 plane cards or phenomenon cards, but the number of phenomenon cards is limited to a maximum of 2