How can you create a combo with Ruthless Knave, Gravecrawler, Pawn of Ulamog, Sifter of Skulls?
user
[START OF COMBO]This combo can be formed with Ruthless Knave, Gravecrawler, Pawn of Ulamog, Sifter of Skulls

Color identity: B
Mana cost: {2}{B}
Steps:
  1. Activate Ruthless Knave's first ability by paying {2}{B} 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 {C}{C}.
  7. Activate the Treasure tokens by tapping and sacrificing them, adding {B}{B}.
  8. Cast Gravecrawler from your graveyard by paying {B}.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You control another Zombie.
[END OF COMBO PREREQUISITES]
assistant