Level 94 Cast on Critical Blood Mage^0.2

Notes

!!!DISCLAIMER!!! This is not a complete league start guide. As of writing this pre-0.3 release we dont have the passive tree, new skill gems, damage number etc. This is just a framework to at least have something !!!DISCLAIMER!!!
I will update this POB daily during the first few days when I test things out.

Build Idea
Use buffed Arc + CoC Snap for clear, create big shock magnitudes, use that for big Lightning Conduit hit, infusions from Orb of Storms for even better Arc. Maybe Firestorm instead as area payoff skill. 
Endgame scaling with Rathpith, crit and crit damage. Many good unique, that are perhaps hard to get, but lots of options for scaling or pivot if this doesnt work out. Also not Deadeye metacuck.

Leveling Setup
Start with ED/Contagion, which is totally fine for the whole campaign, you can also switch earlier to Arc + Orb of Storms. 
I will probably switch around 2nd ascendancy but depends on item drops and how good the infusions feel, if they are very strong I switch at end of act 1. There's just too much we don't know.

See loadouts for levelling skills and support gems

Items
Just get + lvl of spells, damage and movement speed for items during early game. And of course the basics like resistances, life/es, etc. 

Build Mechanics
0.5 early levelling with ED/Contagion is proven to be solid, switch whenever you feel like. Not sure when it feels good to switch.
1. Arc + Cast on Ailment/Critical Snap for Clear (if good enough). Snap consumes shock (bad) but creates Infusions (good).
2. For single target the above with Orb of Storms and Lightning Conduit (barrageable?)
3. Scale shock effect and magnitude for clear and big Lightning Conduit hits
4. Infusions for boosting clear with Arc or Payoff area damage with Firestorm?
5. Damage scaling: shock magnitude, life stacking as Bloodmage (Rathpith Globe = 10% increased damage and 5% crit per 100 life), crit and crit damage. Obviously also generic spell damage scalers like spell/elemental damage, +spell levels, cast speed,
gain % of damage as, crit chance, crit damage
6. Defense scaling: Life stacking, ES buffer, (instant?) leech, damage is best def

NOTE: Lightning Conduit Might not have good enough single target in endgame, we'll have to see. If not we'll figure that out, plenty of choices 

Relevant unique items:
Rathpith Globe (for damage scaling) - need good amount of life for this, expensive, won't be early game item
Atziri's Acuity (instant leech, combine with ascendancy node)
Maligaro's Virtuosity - easy crit damage, not advised very endgame
Seed of Cataclysm Lazuli ring - much damage as well as chaos res

Gem tiers/levels:
Contagion tier 1 gem
Frost Bomb tier 1 gem (just for Exposure, get it when you use elemental spells)
Essence Drain tier 3 gem
Orb of storms tier 3 gem
Arc tier 5 gem
Snap tier 5 gem
Elemental Weakness tier 7 gem
Lightning Conduit tier 13 gem
Cast on ailment tier 14 gem