Many items have been removed from the store. These can now be sold and bought on the Steam Community Market! Workshop contributors will receive a share of each resale of their items. The items that have been removed are not immortal: they may return to the store in future sales or events, or they may appear in the drop list from time to time. The item drop list has been greatly pared down and will now change over time. As new items are introduced old items will be removed (and will be accessible on the Steam Community Market). This should help keep the item drop list interesting over time Entropic Shield and Entropic Axe are now a part of the Entropic set
Edit:

Source : http://www.dota2.com/firstblood

you're welcome.