MArcomage

I would propose an addition of the condition "if your lowest facility is higher than 1", because else you can just ramp your needed facility up to ridicilous values.

Yes; compare the costs of other durable facility+ cards, they each cost enough that the resources or facilities you would need to play the card every turn indefinitely would also allow you to win the game more easily another way. On the other hand, the above tweak seems like it would render the card not really worth using in any deck, since it would often be analogous to a couple Glacial temples but with more chances and less choice-- which is terrible for a rare.

You could change it to "production x0" for a light nerf, or introduce a cost, or both.

Bear in mind adding two 0-cost Durable Rares would affect cards like Halfling Rogue a lot.