This card is truly a beast. Average speed, but high health. Deeplurker helps chip away your opponent, but not as a main damage monster. This card is very prone to magic damage. Hence, we need a strong tank in the front to prevent this fish to become vulnerable. Sometimes we just have to wish our opponent to play cards with low health/speed and focus their damage on our back/front positions.
I agree that Deeplurker should be somewhere in the middle. I like playing this card with Djinn Oshannus and Axemaster. One of the main problems playing this card is killing off monsters designed to be distractions/decoys. Double edged opportunity I would say.