Requires

God-Eternal Bontu must be in hand, or in the command zone. Endrek Sahr, Master Breeder must be on the battlefield. Carnival of Souls must be on the battlefield. Deathgreeter must be on the battlefield. Phyrexian Altar must be on the battlefield. Your life total is at least four. You control less than two Thrulls. Mana needed: plus enough mana to pay for commander tax, if applicable

Steps

1. Cast God-Eternal Bontu either from your hand or from the command zone by paying and commander tax, if applicable.
2. Endrek Sahr triggers, creating five 1/1 Thrull creature tokens.
3. The Thrull tokens enter the battlefield, triggering Carnival of Souls five times.
4. Activate Phyrexian Altar by sacrificing two Thrull tokens, adding .
5. Deathgreeter triggers twice, causing you to gain two life.
6. Resolve each Carnival of Souls, causing you to lose five life and add .
7. Resolve God-Eternal Bontu from step 1.
8. God-Eternal Bontu enters the battlefield, triggering its first ability.
9. Holding priority, activate Phyrexian Altar by sacrificing God-Eternal Bontu, adding .
10. God-Eternal Bontu's second ability and Deathgreeter trigger.
11. Resolve the God-Eternal Bontu trigger, causing you to put it into your library third from the top from your graveyard.
12. Resolve the Deathgreeter trigger, causing you to gain 1 life.
13. Resolve God-Eternal Bontu's first ability from step 8, sacrificing three Thrulls and drawing three cards.
14. Deathgreeter triggers three times, causing you to gain three life.
15. Repeat.
16. Once you have an empty library, you can continue the combo by only sacrificing one Thrull in step 13, and sacrificing the other two Thrulls to Phyrexian Altar.

Results