As for stuff being overpowered I agree.
I have an artifact deck based around these cards:
2 of each of the dragons.
With 6x each basic land, Wall of Junks, Wall Of Spears, Thran Golems, Jayemdae Tomes, and Clay Golems, I can easily hold off attacks and draw cards until I get what I need.
Oh, and some high DD cards like Searing Flesh (7 damage) and Urza's Rage (10, unpreventable)