Infinite death triggersInfinite creature ETBInfinite lifegain triggersInfinite lifelossInfinite creature LTBInfinitely powerful creature until end of turnInfinite creature sacrifice triggers
How it works
Activate Phyrexian Altar by sacrificing Vorapede, adding 1.
Vorapede dies, triggering itself and Kheru Bloodsucker.
Resolve the Vorapede trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
Resolve the Kheru Bloodsucker trigger, causing each opponent to lose 2 life and you to gain two life.
Activate Hex Parasite by paying 1, two life and removing the +1/+1 counter from Vorapede, giving Hex Parasite +1/+0 until end of turn.