Lier, Disciple of the Drowned, Merfolk Secretkeeper // Venture Deeper, Phyrexian Altar, and Desecrated Tomb

Prerequisites

• Lier, Disciple of the Drowned on the battlefield
• Merfolk Secretkeeper // Venture Deeper on the battlefield
• Phyrexian Altar on the battlefield
• Desecrated Tomb on the battlefield

Steps

1. Activate Phyrexian Altar by sacrificing Merfolk Secretkeeper, adding
2. Cast Venture Deeper for its flashback cost by paying , causing target player to mill four cards, then exile Merfolk Secretkeeper
3. Desecrated Tomb triggers, creating a 1/1 Bat token
4. Activate Phyrexian Altar by sacrificing a Bat token, adding
5. Cast Merfolk Secretkeeper from exile by paying
6. Repeat

Results

• Infinite creature tokens
• Infinite mill
• Infinite sacrifice triggers
• Infinite colored mana