If you know your meta well enough to HAVE to include it, then it is a main deck card. I think we keep forgeting about what each other sees from week to week. So when someone lists it mainboard, it can be assumed they are seeing a lot of DOTs.

For me it rides pine, but will produce when called on. I carry the Chromatic Cloak main deck, though that is getting swapped out for Sapphirion once I get enough.