It was one of the major forces making sure there was continual deck flow." "Just curious
If your deck is so lean that it doesnt have counterspells or phasing to deal with a wrath, or youre that averse to getting your engine wiped clean, then you probably need to reconsider your approach to a multiplayer, interactive game, where tools are useful and the best and most interesting games are ones with peaks and troughs, power struggles, and rising from the ashes
Autonomous Assembler and Steel Seraph have decent stats and abilities regardless of which mode they're on, with the Seraph having a short stint in Standard
If you pay one mana, they only need to reveal one land until they stop milling
This also loves things that ensure punch-ability like Rogue's Passage and Whispersilk Cloak
In essence, every MDFC is a slightly overcosted spell combined with a slightly underpowered land (thanks to coming into play tapped or costing three life to come into play untapped, in the case of the mythic MDFC cycle, and only tapping for one color of mana)