Carnage, The Great Killer

Double Strike, Haste
Whenever Carnage, The Great Killer or another Symbiote enters the battlefield under your control, create a Blood token. Each opponent loses 1 life and you gain 1 life. This ability triggers only once each turn.
Blood Sacrifice: Sacrifice three Blood tokens: Each opponent loses life equal to the amount of life you gained this turn.
Symbiotic Vitality: Whenever you sacrifice an artifact, gain 2 life