This is just a casual deck. I tried not adding too many broken cards, but some slipped in (Vesuva, Nevinyrral's Disk, etc.).
Took big inspiration from Darksteel Deck
First custom deck as well :)
The win condition and main playstyle for this deck is to have not only sufficient ability to effectively block all creature damage (if they don't have menace/unblockable etc.), but also to have the same creatures be the main damage output with support cards like Steel Overseer and the equipment (Darksteel Axe and Avarice Amulet).
As I was building the deck, the largest flaw I saw was the inability to survive straight burn damage (I.e. cards that deal direct damage to you). I made up for that with life-gain cards such as Golem's Heart, Radiant Fountain, Tomb of the Spirit Dragon, and Inventors' Fair You also have Vesuva if you want to copy one any one of those lands.
I put in great card draw so you won't run out of steam, especially since you'll have a big discount on your cards with Semblance Anvil. Karn, Scion of Urza and Avarice Amulet (which is perfect since the downside is virtually non-existent due to almost all the creatures being indestructible) is all you'll really need to keep your hand size healthy.
This deck is has such cheese with board clears using All Is Dust and Nevinyrral's Disk, as you'll be destroying the opponents whole board while you're not losing anything. In fact, after you cast All Is Dust, it's nearly an instant win for you, because at 7 mana you'll probably have a stacked board being in mid-game or so, and they just had literally everything removed. Your Darksteel creatures won't be destroyed, or, if you have Darksteel Forge, none of your permenants will be destroyed. I was considering only putting in 1 for that reason, but better safe than sorry.
As said before, you'll possibly have all of your cards discounted by 2 (or 4 if you play the second copy) due to Semblance Anvil. I put 2 in because the Darksteel cards are quite hefty in the mana cost, but also because the entirety of the deck is artifacts, and as such, will be affected by Semblance Anvil.
