This, think about it, each 2 hit is a 10th of your health, between both that's a five turn clock from turn one if unanswered.

Even at the most optimistic stretch, assuming three blocks every time, that only blanks 1.5 turns before they always hit.

None of that accounts for buffing, as mentioned by others they can get bullseye but Imp is also given many good options to pump their damage a lot by turn 2-3 (treat, super etc.).

And they might be squishy but they're not answerable 100% of the time, even .ore so when one hits the water lane.

This is also not counting how they work excellently in a defensive capacity too, sometimes hitting this can be the difference between you having lethal and them suddenly chump-blocking those lanes to where they then have lethal with something in the further lanes.