Evolution of a naturally invisible predator

I'd like to tip my hat to this week's fortnightly challenge with this question by revisiting an old one.

I asked a question about the Science behind a naturally invisible creature a while ago. At the time, I was handwaving the evolutionary concerns of my Sneaky Devils and looking only at the end result. From the answer to that question, I reengineered my Sneaky Devils so they constantly emitted a magnetic field specifically designed to interfere/disrupt the visual processing of nearby creatures (induced hemianopsia), but which has no effect on similarly developed creatures (they can't force each other to ignore the other).

Suppose that a predatory creature developed in this fashion. What would be the evolutionary concerns guiding its development?

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Evolution of a naturally invisible predator

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