You need to be very cautious or very lucky when choosing who and when to mill or you might make your opponents deck better
You may reveal a location card and put it into your hand
Well, for starters both those cards are much worse than Doom Blade
Gamma White - Alpha, Beta, Gamma Playtest cards Gamma Blue - Alpha, Beta, Gamma Playtest cards Gamma Black - Alpha, Beta, Gamma Playtest cards Gamma Red - Alpha, Beta, Gamma Playtest cards Gamma Green - Alpha, Beta, Gamma Playtest cards Gamma Gold - Alpha, Beta, Gamma Playtest cards Gamma Artifact - Alpha, Beta, Gamma Playtest cards Gamma Basic Lands - Alpha, Beta, Gamma Playtest cards Others - Alpha, Beta, Gamma Playtest cards MISSING SOURCES (Artifact, Blue, Black) - Alpha, Beta, Gamma Playtest cards MISSING SOURCES (Red, Green, White, Basic Land) - Alpha, Beta, Gamma Playtest cards
While likely not quick enough to dodge the first round of removal, this gives us many options on our timing for casting her (waiting for removal to be used on someone else, for example)