I am not a fan of Conjure Phantasm. I find it costs a bit too much for Ranger and the effect is... soso. But I guess if you combo it with Poison, you'll have a nice -9 degen already. And then you add Bleeding from Hunter shot. That's -10 (-12 to be exact).
I like using Power Spike and Power Leak. I save those for casters. Power Leak really messes them up. Doing 80+ on Monk is not as powerful as doing -21 energy on Monk. A Monk can heal 100 health with one spell but -21 takes away at least 4 spells casting.