Activate up to five lands by tapping them, adding at least .
Cast Anti-Venom by paying .
When Anti-Venom enters, its first ability and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, returning nothing to your hand.
Resolve the Anti-Venom trigger, returning Peregrine Drake from your graveyard to the battlefield.
When Peregrine Drake enters, it and Cloudstone Curio trigger.
Resolve the Peregrine Drake trigger, untapping up to five lands.
Resolve the Cloudstone Curio trigger, returning Anti-Venom from the battlefield to your hand.
Activate Shilgengar by sacrificing Peregrine Drake.
Repeat.
This clever loop turns the mana-untapping power of Peregrine Drake into an engine for infinite Blood tokens and death triggers, all anchored by Cloudstone Curio's bounce ability. When you cast Anti-Venom, its entrance trigger reaches into your graveyard to pull back Peregrine Drake, which in turn triggers Cloudstone Curio to bounce Anti-Venom safely back to your hand so you can recast it. Meanwhile, Shilgengar, Sire of Famine provides the necessary outlet by sacrificing the Drake to generate Blood tokens, letting you continually cycle through your creatures and harvest endless resources.