Atog is one of those cards that laid dormant for some time until someone realized it's potential. The Atog deck of course plays a large amount of artifacts, because otherwise the Atog itself is just a 1/2 for two. But exactly which artifacts to play is open for discussions.
Some decks use Mana Vault, Su-Chi and Fireball for some nice synergy. Other decks take a more suicidal route and play a lot of cheap artifacts that first do some damage and then can be sacrificed to deal the finishing blow. Copper Tablets and Ankh of Mishra are probably the most common ones.
It's also common for the Atog decks to play a lot of burn in the form of Lightning bolt and Chain Lightning. If you want to splash another color, green should be high on your list as it gives you access to Berserk, and there are few things as scary as a berserked Atog.