If this were my deck I would remove a fair bit of the "everyone discards" cards and only keep the powerful ones, then get rid of the cards that make you draw. Then I'd add controlled discard so you can mess up their combo's which will stall them for ages - like have a despise, make them discard their best dude then surgical extraction and get rid of all of them, then even if you both end up top decking you've severely hurt his deck. However if you plan on going down that route, Quest for the Nihil stone won't be as useful as it's likely that they'll have cards in hand. In which case I would exchange them for painful quandary which you can stall for by making them discard, then once you have it and liliana's caress out then have to take two damage and discard or take 5 damage every time they do something - making it almost impossible for them to get value for their spells. Also on the land comment, it's likely that, if you keep the deck as it is, you would be wanting to discard land instead of your spells so you would need to draw more land than you need.
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Doubling Season + Devour + Tokens = Hax - Really expensive though. Emrakul's Hatcher, Growth Spasm and Nest Snatcher are good too. I would also opt for a bit more mana ramp, possibly Birds of Paradise instead of/in addition to Llanowar Elves.
Have you play tested this? - I'm doubtful that 20 land will be enough. Also this combination seems risky, as it's likely that you'll be top decking by turn 3 or 4. If I were you I would be adding some more cheap controlled discard into this deck, like Duress, Despise, Inquistion of Kozilek, Surgical Extraction, Thoughtseize, etc (in order of cost :P) Also, screw The Rack and +2 Quest for the Nihil Stone
Not sure about the [fog] and [explore]... I mean I see [explore]'s usefulness but I can't see the need for [fog] really, I mean if you get a fairly decent hand you should always have blockers out. I would remove [fog] and [explore] and put in [Green Sun's Zenith] and something with reach, then have an anti-control sideboard with things like... [autumn's veil], [summoner's trap] etc.
This deck looks fun, I would advise that you remove [[Auriok Sunchaser]], [[Kemba, Kha Regent]] (because really you want your equipment where it'll get you damage, this isn't a control deck) and add two more [[Auriok Edgewright]] and consider [[Concussive Blast]] as an "I win" card. Also you might want to consider [[Lightning Greaves]] or [[Swift Boots]] against control. I would also consider adding some more land into this, equipment decks can be deceiving in that cards are cheap, but really you want to be playing and equipping each turn so you actually need quite a few land drops.