Main II : Play lands, permanents, or spells
In Pauper, it eventually proved too efficient and earned a ban in a meta where it demanded removal on sight the moment it hit the battlefield
For example, if the revealed card is a noncreature artifact card and March of the Machines (an enchantment with "Each noncreature artifact is an artifact creature with power and toughness each equal to its mana value.") is on the battlefield, it won't be turned face up
The deck was actually pretty fun to play, especially for a mill deck, and while it's not insanely competitive, it's good enough to steal some wins in a really unique manner
While all these gold cards are inherently awesome and do very powerful things, it can often be very difficult to find a place to play them due to their mana requirements
Combine that with the Dungeon room that forces an opponent to lose five life and winning the game becomes trivial