Activate Viscera Seer by sacrificing Boonweaver Giant
When Boonweaver Giant dies, Necrogen Communion triggers, returning Boonweaver Giant from your graveyard to the battlefield
When Boonweaver Giant enters, it triggers, returning Necrogen Communion from your graveyard to the battlefield attached to Boonweaver Giant.
Resolve the Viscera Seer ability from step 1.
Repeat.
This elegant loop is fueled by a seamless, self-sustaining partnership between Boonweaver Giant and Necrogen Communion. When you sacrifice the Giant to Viscera Seer, the Aura triggers to resurrect the Giant, which in turn enters the battlefield to fetch the Aura right back to itself. Because Viscera Seer's sacrifice ability has no mana cost, you can repeat this cycle endlessly to generate boundless entry, exit, and death triggers alongside an infinitely deep scry.