Crab Umbra + Pitiless Plunderer Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite colorless mana

Combo 1 with Jan Jansen, Chaos Crafter + Krark-Clan Ironworks

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite colorless mana · Infinite creature tokens
Steps
  1. Activate Jan Jansen's second ability by tapping it and sacrificing any other noncreature artifact, creating two 1/1 Construct creature tokens.
  2. Activate Krark-Clan Ironworks twice by sacrificing both Construct tokens, adding {C}{C}{C}{C}.
  3. When the Constructs die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
  4. Activate a Treasure by tapping and sacrificing it, adding {U}.
  5. Activate Crab Umbra by paying {2}{U}, untapping Jan Jansen.
  6. Repeat.

Combo 2 with Jan Jansen, Chaos Crafter + Ashnod's Altar

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite colorless mana · Infinite creature tokens · Infinite colored mana · Infinite Treasure tokens
Show steps
  1. Activate Jan Jansen's second ability by tapping it and sacrificing any other noncreature artifact, creating two 1/1 Construct creature tokens.
  2. Activate Ashnod's Altar twice by sacrificing both Construct tokens, adding {C}{C}{C}{C}.
  3. When the Constructs die, Pitiless Plunderer triggers twice, creating two Treasure tokens.
  4. Activate a Treasure by tapping and sacrificing it, adding {U}.
  5. Activate Crab Umbra by paying {2}{U}, untapping Jan Jansen.
  6. Repeat.
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