This is a borderline 3-star/4-star, but I think there are too many ways it can work not to bump it over the line (I expect a 2-2 projection). While a good number (27) of the cards have shown up in other decks, they have been scattered across many. Here, every non-land card (and one land) deals with counters in some fashion or another. They all have counters, grant counters, or produce more counters. As with some of its distant cousins, not all successful—though Beast Mode stands as a clear example of what can go right—this one risks mana problems, but almost any start that gets to three land within the first four turns should grow fairly well. The 10/13/12/3/2 curve averages 2.35, which is getting a little high, but the higher-cost spells all have significant value. The name comes from the photography technique that exposes paper twice, while it rests in developer, the silver piling up and producing a halo-effect around dark areas.