Yes, I strongly feel an equipment is appropriate. I also added 2 artifact creatures (so it now totals 6 artifacts). The +2/+0 seems to be the right spot for the deck. The cost isn't too low or too high. +3/+0 puts the power into a new threshold, and adding any toughness at all also changes a lot. I was also considering Explorer's Scope. It's on flavor, it does something the deck would want, the artwork even tells you how to use it ("Equip me to the Pilgrim's Eye!"). But I don't feel the Eldrazi player would consider it a pressing priority to destroy. This hammer on the other hand, I do think so. Increasing tension like this increases excitement, especially when you draw that one card you've been looking for, be it this, tuktuk scrappers, or other. As far as the unused potential, yes it's a little awkward from a development point of view, but are you actually going to mind as a player? And since when has that sort of thing stopped Wizards in their duel decks? And if you play it against another deck, then it will have a chance to shine.