Harald Unites the Elves, Moritte of the Frost, and Leyline of Singularity

Prerequisites

• Harald Unites the Elves in hand
• Moritte of the Frost in the graveyard
• Leyline of Singularity on the battlefield
• available

Steps

1. Cast Harald Unties the Elves by paying , 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

Results

• Infinite self-mill