Vohar, Vodalian Desecrator, Haunted One, Cauldron of Souls, Deceiver Exarch, and Bloodflow Connoisseur

Prerequisites

• Vohar, Vodalian Desecrator on the battlefield
• Haunted One on the battlefield
• Cauldron of Souls on the battlefield
• Deceiver Exarch on the battlefield
• Bloodflow Connoisseur on the battlefield
• Vohar is your commander and does not have summoning sickness
• Deceiver Exarch does not have a +1/+1 counter on it

Steps

1. Activate Vohar's first ability by tapping it
2. Vohar triggers, giving creatures you control that share a creature type with it +2/+0 and undying until end of turn
3. Resolve the Vohar ability from step 1, causing you to loot
4. Activate Bloodflow Connoisseur by sacrificing Deceiver Exarch
5. When Deceiver Exarch dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it
6. When Deceiver Exarch enters the battlefield, it triggers, untapping Cauldron of Souls
7. Resolve the Bloodflow Connoisseur ability from step 4, putting a +1/+1 counter on it
8. Activate Cauldron of Souls by tapping it, giving Deceiver Exarch persist until end of turn
9. Activate Bloodflow Connoisseur by sacrificing Deceiver Exarch
10. When Deceiver Exarch dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
11. When Deceiver Exarch enters the battlefield, it triggers, untapping Vohar
12. Resolve the Bloodflow Connoisseur ability from step 9, putting a +1/+1 counter on it
13. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Infinite looting
• Near-infinite +1/+1 counters on Bloodflow Connoisseur
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinitely powerful Phyrexians, Merfolks and Wizards you control until end of turn
• Near-infinite sacrifice triggers