Phyrexian Altar + Thaumatog Combos

3 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite colored mana Infinite sacrifice triggers Infinite death triggers

Combo 1 with Emeria Shepherd + World Shaper

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite self-mill · Infinite landfall triggers · Return all nonland permanents from your graveyard to the battlefield · Infinitely large creature until end of turn
Steps
  1. Activate Thaumatog by sacrificing a land.
  2. Repeat step 1 until you control no lands.
  3. Activate Phyrexian Altar by sacrificing World Shaper.
  4. When World Shaper dies, it triggers, return all lands from your graveyard to the battlefield tapped.
  5. When the lands enter, Emeria Shepherd triggers that many times.
  6. Resolve an Emeria Shepherd trigger that was triggered by a Plains, returning World Shaper from your graveyard to the battlefield.
  7. Resolve all remaining Emeria Shepherd triggers.
  8. Repeat

Combo 2 with Scouring Swarm + Drownyard Temple

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinite tapped creature tokens · Infinite landfall triggers · Infinitely large creature until end of turn
Show steps
  1. Activate Thaumatog by sacrificing Drownyard Temple.
  2. Each Scouring Swarm you control triggers, creating a tapped token copy of itself.
  3. Resolve the Thaumatog ability.
  4. If you control four or more Scouring Swarms, activate Phyrexian Altar by sacrificing a Scouring Swarm, adding {1}.
  5. Repeat step 4 until you control three Scouring Swarms or until you have {3} available, whichever comes first.
  6. Activate Drownyard Temple by paying {3}, returning it from your graveyard to the battlefield.
  7. Repeat.

Combo 3 with Rakdos Joins Up + Archon of Falling Stars

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers · Infinitely large creature until end of turn
Show steps
  1. Cast Rakdos Joins Up by paying {3}{B}{R}.
  2. When Rakdos Joins Up enters the battlefield, its first ability triggers.
  3. Holding priority, activate Thaumatog by sacrificing Rakdos Joins Up.
  4. Resolve the Rakdos Joins Up ability, returning Archon of Falling Stars from your graveyard to the battlefield with two +1/+1 counters on it.
  5. When Archon of Falling Stars enters the battlefield, it triggers.
  6. Holding priority, activate Phyrexian Altar by sacrificing Archon of Falling Stars.
  7. Resolve the Archon of Falling Stars ability, returning Rakdos Joins Up from your graveyard to the battlefield.
  8. Repeat from step 2.
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