mtg if a card would be exiled Leyline of the Void · Duskmourn: House of Horror (DSK) #106 · Scryfall Magic: The Gathering Search Do You Know All 3

They include 14 objects, 12 of which are magic cards

No, changelings are not artifact creatures

Thoughtcast was already in the deck, so adding its metallic, Mulldrifter-like friend, Thought Monitor, makes perfect sense

Might be harder to justify in Dihada and a GW deck, but at the same time, treasure fixes all problems

It is as cheap as can be, with no draw back what so ever and draws you more cards than many of the others do

Arabian Nights, as an even earlier expansion, and one that Garfield designed more-or-less by himself (with contributions from the games other Alpha designers) in a very short period of time has no unifying design theme