Challenge Set #2 (spoilers)

March of the Machines: (artifacts only, AI decks randomly selected from challenge #1 decks)
Defeated with the following deck: (won Tangle Wire)
.17 1 Black Lotus
.165 1 Mox Emerald
.166 1 Mox Jet
.167 1 Mox Pearl
.168 1 Mox Ruby
.169 1 Mox Sapphire
.230 1 Sol Ring
.1879 4 Etherium Sculptor
.1706 4 Master of Etherium
.1216 4 Seat of the Synod
.1682 4 Darksteel Citadel
.1547 4 Frogmite
.1548 4 Myr Enforcer
.1210 4 Silver Myr
.1714 4 Skullclamp
.1677 4 Arcbound Ravager
.1676 4 Arcbound Worker
.1775 4 Mind Stone
.1571 3 Serrated Arrows
.1724 4 Cranial Plating
.1550 1 Voltaic Key
.248 1 Time Vault
Very simple. It's basically affinity without the nonartifacts :p If you haven't unlocked Serrated Arrows, don't worry, it's the least important card in the deck. Just throw in almost anything else and you'll be fine. Occasionally the deck gets manascrewed, but there isn't much that can be done about it, since only artifacts are allowed.
Defeated with the following deck: (won Tangle Wire)
.17 1 Black Lotus
.165 1 Mox Emerald
.166 1 Mox Jet
.167 1 Mox Pearl
.168 1 Mox Ruby
.169 1 Mox Sapphire
.230 1 Sol Ring
.1879 4 Etherium Sculptor
.1706 4 Master of Etherium
.1216 4 Seat of the Synod
.1682 4 Darksteel Citadel
.1547 4 Frogmite
.1548 4 Myr Enforcer
.1210 4 Silver Myr
.1714 4 Skullclamp
.1677 4 Arcbound Ravager
.1676 4 Arcbound Worker
.1775 4 Mind Stone
.1571 3 Serrated Arrows
.1724 4 Cranial Plating
.1550 1 Voltaic Key
.248 1 Time Vault
Very simple. It's basically affinity without the nonartifacts :p If you haven't unlocked Serrated Arrows, don't worry, it's the least important card in the deck. Just throw in almost anything else and you'll be fine. Occasionally the deck gets manascrewed, but there isn't much that can be done about it, since only artifacts are allowed.