Ruthless Knave, Gravecrawler, Pawn of Ulamog, and Sifter of Skulls

Prerequisites

• Ruthless Knave on the battlefield
• Gravecrawler on the battlefield
• Pawn of Ulamog on the battlefield
• Sifter of Skulls on the battlefield
• You control another Zombie
• available

Steps

1. Activate Ruthless Knave's first ability by paying and sacrificing Gravecrawler
2. Gravecrawler dies, triggering Pawn of Ulamog and Sifter of Skulls
3. Resolve the Pawn of Ulamog trigger, creating a 0/1 Eldrazi Spawn creature token
4. Resolve the Sifter of Skulls trigger, creating a 1/1 Eldrazi Scion creature token
5. Resolve the Ruthless Knave ability from step 1, creating two Treasure tokens
6. Activate the Eldrazi Scion and Eldrazi Spawn by sacrificing them, adding
7. Activate the Treasure tokens by tapping and sacrificing them, adding
8. Cast Gravecrawler from your graveyard by paying
9. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite storm count