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It'll work well until you run into a Priests offense and none of the capture stuff works.Or until you run into a TGT deck and all your ECs get captured by Women as Snares, and you get ignored despite PTR's protection against ignore.
At worst, it is not benefitting me and its slot (both in the deck and on the artifact pile) could be used up with a better card. At absolute best, I'll snipe a dom, but the chances of that happening are like 1/10, and I don't like those odds.
Actually the chances are anywhere from 1/5 to 1/7 unless your opponent is a n00b and doesn't use many Dominants. That's not even accounting for all the other great cards it might discard from the top. Pol is right, it's a great card for any Egyptian defense.