Infinite black manaInfinite creature tokensInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite mana artifacts you control can produceInfinite creature sacrifice triggersInfinite untap of artifacts you control
How it works
Activate Illuminor Szeras by tapping it and sacrificing Threefold Thunderhulk, adding seven .
Activate Epitaph Golem by paying 2, putting Threefold Thunderhulk on the bottom of your library.
Activate Grenzo by paying 2, putting Threefold Thunderhulk from the bottom of your library into your graveyard, then putting it onto the battlefield.
When Threefold Thunderhulk enters the battlefield, it triggers, creating three 1/1 Gnome artifact creature tokens.
Activate Clock of Omens by tapping Threefold Thunderhulk and a Gnome token, untapping Illuminor Szeras.
Repeat.
This elegant loop revolves around constantly recycling Threefold Thunderhulk from the graveyard and back to the battlefield using Grenzo, Dungeon Warden's ability to pull creatures directly from the bottom of your library. To keep the engine running, Epitaph Golem securely shuffles the Thunderhulk right back to that bottom position, while Illuminor Szeras generously converts the massive creature's hefty mana value into a surplus of black mana upon sacrifice. Meanwhile, Clock of Omens acts as the perfect mechanical lubricant, tapping the freshly-spawned Gnome tokens alongside the Thunderhulk itself to instantly untap Illuminor Szeras and ready the loop for its next iteration.