A fun little affinity artifact deck that I put together combining elements from a couple other artifact decks. Essentially, the end-game of this deck is to wipe the board, except for select creatures and artifacts on your side, and swing for fatal in one or two turns, but this is certainly not the only way of winning.
First we include Leaden Myr and Silver Myr for some early ramp in mana. Darksteel Myr also provides some good early game chump blocking, and when combined with Darksteel Axe it can also dish back some damage. In terms of actual land, the inclusion of Darksteel Citadel, Seat of the Synod, and Vault of Whispers help with our affinity aspects.
Our affinity creatures are Broodstar and Myr Enforcer, which can both come out pretty early on and hit for nice chunks of damage, or serve well as defenders while the deck ramps up to the main win con, Phylactery Lich. When putting this card into play, it's essential that an indestructible artifact is also in play, such as a Darksteel Relic, to put the phylactery counter on. If this is done, Phylactery Lich will be a 5/5 for 3 that won't be leaving the battlefield unless exiled. Once on the field, Prowler's Helm will help the Lich hit the opponent without interference.
Assert Authority is another incredibly useful card as it can be cast for low mana due to affinity and is able to counter spells that might ruin the tactic of the deck, such as spells that exile permanents.