Blood Vial

A deck can have 20 cards max named Blood Vial.
{t}, Sacrifice Blood Vial: Gain 2 life. Use this
effect only when your life is below your starting
total and only if you lost life this turn.
"Once a patient has had their blood ministered, a
unique but common treatment in Yharnam, successive infusions recall the first, and are all the more invigorating for it. No surprise that most Yharnamites
are heavy users of blood."