Gore Spike

Grants 1% increased Critical Damage Bonus per 20 Life.
This is incredibly strong for crit-based builds. With just 2000 life, you’ll already get 100% increased Critical Damage, making it an excellent choice for Path of exile currency crit-focused Bloodmage builds.
Vitality Siphon

Provides 10% of spell damage leeched as life, which is a great passive for sustaining your life pool while casting spells.
Combine this with Voracious for instant leech, or Vaal Pact for more immediate life sustain.
Crimson Power

Adds Energy Shield from Body Armour as extra Maximum Life.
This passive can improve your survivability and fits well with Gore Spike, but it may take more points to Path of exile currency for sale reach than other passives.