Hi All, i'm a long time lurker on this Forum and actually this is my first post.
My name is Matt Harper and i finished 5th at the latest BOM Paris vintage event playing demon Oath, the deck is a blast to play with really good game against the field, i did however only loose in to one guy who was the eventual winner after my deck decided to just draw mana after my initial good starting hand, that said i dont think i'd change the deck much at all. If you want to see the deck go take a look on the bazaar of Moxen top 8 page.
I responce to shops and maindeck cages i've found that in demon Oath a cage is actually not too bad anyway sure we have drains, missteps and forces to counter in and if we are on the play a thoughtseize can take it before they get to play it but i've been on the end of an early cage and still won with demon oath, with the grisslebrand/emrakul versions its virtually GG but demon Oath is fine. As long as you can continue your game plan you can still activate the Oath and essentially tutor a demon to the top of your deck then draw and cast it.
Regards
Matt