Hi I'm Addiction,
TLDR guide: Butcher Patch
Questions: Twitter @addic03 or twitch.tv/addic03
enjoy.

T1: Push lanes get stacks TP to fights.

T2: Barrage = Low damage team, Manic = Low heal team, Peekaboo can be good too

T3: Phase shield if you have a squish team, Dream shot if you lack damage, cleanse can be good too.

T4: EW for disengage/disrupter teams, Blink heal = mobility + direct heals, depends on other supports ult.

T5: Escape/chase potential.

T6: Critter = low damage team, GPoly = Counter a annoying hero, bounce can be good for uber chase.

T7: Now you can have a crab and a squirrel at the same time!

T1: Be everywhere, bribes good too.

T2: +healing always good,Peekaboo can be situationally good.

T3: Torn between Mystified and Phase shield, probably team specific, Cleanse can be viable too.

T4: Direct heal and mobility, allows you to bait yourself and port to an allie in your back line.

T5: Mitigation is great esp with the synergy from T6

T6: Give 4/5s of your team 50% magic reduction for 4 seconds.

T7: Rewind will always be good in some cases you need shield for early mitigation.