Activate Viscera Seer by sacrificing Gravecrawler.
When Gravecrawler dies, The Ghoul triggers, causing you to get two rad counters and create a Treasure token.
Resolve the Viscera Seer ability.
Activate the Treasure by tapping and sacrificing it, adding .
Cast Gravecrawler from your graveyard by paying .
Repeat.
This elegant loop uses Viscera Seer as a reliable sacrifice outlet to continuously bin Gravecrawler, which easily bypasses the graveyard by seeing itself cast again thanks to its own zombie-casting condition. Meanwhile, The Ghoul, Gunslinger oversees the whole tragic cycle from the battlefield, turning each of Gravecrawler's deaths into a fresh Treasure token. Sacrificing that very same Treasure then conveniently supplies the exact black mana needed to replay Gravecrawler from the graveyard, sustaining an endless loop that fuels your scrys, rad counters, and storm count indefinitely.