User blog comment:Affectos/Artifacts of the Past! WH13 meets YuGiOh/@comment-893816-20131224010644/@comment-4273152-20131224021445

Why? That's extremely limiting and many artifacts have enough personality to be considered creatures in their own right. Besides, only having Warehouse Agents while making the rest spell/traps would skew the monster/support ratio well out of balance for a respectable deck.