You might consider Doom Blade instead of fatal blow, or a combination of the two. It costs only one colorless more, which you would have to spend in black to activate pestilence before using Fatal Blow anyway. Doom Blade might also come in handy if you need to get rid of something before Pestilence gets out, but its weakness is its inability to affect black creatures. Also, protection from black works just fine for your creatures, as I am sure you already know. (It prevents the damage, regardless of Pestilence's lack of targetting requirement.)
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