Looking food my friend! And for a Legacy Affinity deck, just add 4x Seat of the Synod , 4x Great Furnace , 4x Vault of Whispers and 2-4x Tezzeret, Agent of Bolas . Seriously, you could easily break into Legacy. Try this out and get used to piloting the Modern version, then if you so desire, construct a Legacy version.

Idk if you really need all 4 Mox Opal s. Affinity wants to dump its hand in two turns, not have a bunch of legendary mana artifacts keeping you from reaching critical mass on the board. I guess you can have your Arcbound Ravager s eat them if you have multiples in hand, but I'd probably go down to 3 or maybe even 2.

Besides my personal opinions, this looks freaking amazing.

Pre M14 rules changes, I'd have definitely agreed with you, and wouldn't have put in all of them, but with the new legendary ruling any multiples I've got in hand at the start aren't just dead drops. I can play one, tap for mana, play another, sac the first keeping the second and tap again for another mana. It's definitely made the deck much more aggressive, so I think I'm going to keep it at 4 right now.

Myr Enforcer wouldn't be a terrible addition in place of the Vault Skirge .Then again you could also run Frogmite

if you want more early/scary agression i would put some Porcelain Legionnaire they are scary early on and a nice target for your counters if your ravanger would die

I, after playing affinity for a short while before realising it was far out of my price range (it was proxied), I found that Arcbound Ravager didn't really work well with Master of Etherium , due to the fact that for one, you want artifacts on the field, and the other, you want to sacrifice them to make it solely bigger. But, they are still a forece to be reckoned with, so I would:

-2 Arcbound Ravager ,

+1 Galvanic Blast

and +1 Shrapnel Blast .

This is because at the moment, you don't have enough interaction with the opponent for my liking, and you are kind of stuck if they kill off one of your artifacts, or play a slightly bigger creature than you can deal with.

Thanks for the suggestions everyone!

@Tonberry333: I'll probably pass on those. The main reason I like Vault Skirge is that it's a cheap artifact creature with evasion (and the lifelink certainly doesn't hurt). Myr Enforcer and Frogmite just seem like bigger, conditional Memnite s.

@koopinette: As much as I like Porcelain Legionnaire (had a casual deck with a playset once, lots of fun), they're a bit too pricey mana cost wise for what they do. If they had some form of evasion, I'd be much more likely to put them in, but with only first strike my opponent can just chump all day and get to mid/late game to stabilize.

@Kittacus: That's a good point, and one I hadn't really considered. I like Arcbound Ravager over Master of Etherium largely due to its potential to just go nuclear, sac a bunch of artifacts, and leave them on a creature with decent/good evasion (i.e. Etched Champion , Ornithopter , Vault Skirge , or Signal Pest ). I think I'd rather take out a Master to preserve this effect, but I definitely agree that the deck needs more ways to interact with the opponent. I like the +1 Shrapnel Blast , but for now I think I'm going to keep the other two Master of Etherium s. I'll playtest it some more this weekend post revision and see if anything else needs to be tweaked.

Again, thanks everyone for all the comments!

No Chalice of the Void on the sideboard? It's great against combo. And what about the staple Tezzeret, Agent of Bolas ? It's Modern legal, isn't it? And I'm not a particular fan of arcbound. Maybe Ethersworn Canonist ?

Anyway, +1!