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} magic symbol) , two life and removing the +1/+1 counter from Vorapede, giving Hex Parasite +1/+0 until end of turn.
Repeat.
Results
Infinite colorless mana.
Infinite death triggers.
Infinite ETB.
Infinite lifegain triggers.
Infinite lifeloss.
Infinite LTB.
Infinitely powerful Hex Parasite until end of turn.