On a whim I picked up some Thought Monitors and Sojourner's Companions, thinking a legitimate 8x Thoughtcast + free dudes setup might be good enough in Legacy. This is a budget list for now, just something to mess around with. Obvious upgrades come in the form of Urzas Saga, Arcbound Ravager, possibly Nettlecyst, maybe Chalice, and a 4th Mox Opal. I'm testing the tapped artifact lands because they 'add' mana even while entering tapped. The critical mass of blue mana is needed to feed the 8 card draw engines. I've had insane turns where chaining 2 thoughtcast/monitors just feeds more free 4/4's and 2/2's. Like 20+ power on the board turn 3. I genuinely think there is a way to make this a legit aggro deck.
First draft:
4x Ornithopter
1x memnite
4x frogmite
4x myr enforcer
4x sojourner's companion
4x thought monitor
4x master of ethereum
4x cranial plating
4x springleaf drum
3x Mox Opal
4x Mishra's bauble
1x welding jar
4x thoughtcast
4x seat of the synod
4x razortide bridge
4x mistvault bridge
1x darksteel citadel
2x blinkmoth nexus
Rough draft sideboard:
4x Tormod's Crypt
4x Force of Will
2x Force of Negation
2x Steel Sabotage
2x Ethersworn Canonist
1x Engineered Explosives
Second Draft, testing inclusion of Salvage Titan and non-Force sideboard.
4x Ornithopter
1x Memnite
4x Frogmite
4x Myr Enforcer
4x Sojourner's Companion
4x Thought Monitor
3x Salvage Titan
2x Master of Etherium
4x Springleaf Drum
4x Cranial Plating
4x Thoughtcast
3x Mox Opal
4x Lotus Petal
4x Seat of the Synod
4x Mistvault Bridge
4x Razortide Bridge
1x Darksteel Citadel
2x Blinkmoth Nexus
Sideboard
4x Thoughtseize
3x Steel Sabotage
2x Ethersworn Canonist
4x Tormod's Crypt
2x Stubborn Denial