Emmara, Soul of the Accord + Ashnod's Altar + Cryptolith Rite + Umbral Mantle + Concordant Crossroads

Emmara, Soul of the Accord
Ashnod's Altar
Cryptolith Rite
Umbral Mantle
Concordant Crossroads

Requires
Emmara, Soul of the Accord must be on the battlefield. Ashnod's Altar must be on the battlefield. Cryptolith Rite must be on the battlefield. Umbral Mantle must be on the battlefield. Concordant Crossroads must be on the battlefield. Umbral Mantle attached to Emmara, Soul of the Accord.
Steps
  1. Use Cryptolith Rite to tap Emmara, Soul of the Accord for 1.
  2. Emmara, Soul of the Accord triggers creating a token creature.
  3. Use Cryptolith Rite to tap the token creature for 1.
  4. Sacrifice the token creature to Ashnod's Altar floating 2.
  5. Activate Umbral Mantle to untap Emmara, Soul of the Accord.
  6. Repeat.
Results
Infinite colored mana. Infinite colorless mana. Infinite ETB. Infinite LTB. Infinitely large Emmara. Infinite sacrifice triggers. Infinite tokens.

Emmara, Soul of the Accord
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