New summoner spell ideas

I've been thinking that maybe we need more variety in summoner spells. I never see or{{summoner:2}}, and maybe those deserve a rework or something.

Empower - 140 seconds http://imgur.com/hz4MvCv Your next non-ultimate attack will deal a bonus 50% of your highest damaging stat.

Absorb - 120 seconds The next non-ultimate incoming attack will be negated and will heal you for 35% of the damage it would've dealt.

Pierce - 90 seconds The next attack will have +15/+35/+55 penetration respective to its damage.

Prism - 90 seconds The next attack will be converted into its opposite form of damage.

Pis Aller - 220 seconds Deal true damage based on your missing health.