The main points seem to be that the two booster types caused market confusion, draft boosters weren't selling well, and this both split the player base and caused problems for stores
If a permanent has none of the listed types (for example, a Planeswalker with no other types), it cant be chosen
It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager
Also, the price-tag for City of Brass is significantly lower than that of Mana Confluence
Atog deck: 25 Cards known to exist, to be completed with the missing ones: Counterspell (7th Edition) Entomb (Odyssey) Fact or Fiction (Invasion) Fire / Ice (Apocalypse) Flametongue Kavu (Planeshift) Island 332/350 (7th Edition) Island 333/350 (7th Edition) Island 334/350 (7th Edition) Island 336/350 (Invasion) Island 337/350 (Invasion) Island 338/350 (Invasion) Island 335/350 (Onslaught) Island 337/350 (Onslaught) Island 338/350 (Onslaught) Nightscape Familiar (Planeshift) Psychatog (Odyssey) Repulse (Invasion) Salt Marsh (Invasion) Shadowmage Infiltrator (Odyssey) Shivan Reef (Apocalypse) Syncopate (Odyssey) Underground River (7th Edition) Undermine (Invasion) Urborg Volcano (Invasion) Urza's Rage (Invasion) Mini MTG Cards Angry Dog Deck Uncut Sheet 10 x 11 front
Stinkweed Imp Stinkweed Imp is a powerful dredge card often seen in older formats