How can you create a combo with Harald Unites the Elves, Moritte of the Frost, Leyline of Singularity?
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[START OF COMBO]This combo can be formed with Harald Unites the Elves, Moritte of the Frost, Leyline of Singularity

Color identity: BGU
Mana cost: {2}{B}{G}
Steps:
  1. Cast Harald Unties the Elves by paying {2}{B}{G}, causing it to enter the battlefield with a lore counter on it.
  2. Harald Unites the Elves' first chapter ability triggers, causing you to mill three cards, and return Moritte from your graveyard to the battlefield as a copy of Harald Unites the Elves with one lore counter on it.
  3. Put Moritte of the Frost into your graveyard due to the legend rule.
  4. Moritte of the Frost's first chapter ability triggers, causing you to mill three cards, and return Moritte from your graveyard to the battlefield as a copy of Harald Unites the Elves with one lore counter on it.
  5. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Harald Unites the Elves must be in your hand
  - Moritte of the Frost must be in the graveyard
  - Leyline of Singularity must be on the battlefield
[END OF COMBO PREREQUISITES]
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