How can you create a combo with Estrid, the Masked, Sanctum of Eternity?
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[START OF COMBO]This combo can be formed with Estrid, the Masked, Sanctum of Eternity

Color identity: GWU
Mana cost: {5}{W}{U}{G}
Steps:
  1. Activate Estrid's second loyalty ability by removing one loyalty counter, creating a Mask Aura token and attaching it to Sanctum of Eternity.
  2. Activate Sanctum of Eternity by paying {2} and tapping it, returning Estrid to your hand.
  3. Activate all other enchanted permanents that can produce at least {4}{W}{U}{G}.
  4. Cast Estrid by paying {1}{W}{U}{G}.
  5. Activate Estrid's first loyalty ability by putting two loyalty counters on it, untapping all enchanted permanents you control.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite colorless mana
  - Infinite mana your enchanted permanents can produce[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Estrid and Estrid has at least two loyalty counters.
  - Enchanted permanents you control are able to tap for at least {4}{W}{U}{G}.
[END OF COMBO PREREQUISITES]
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