Cast Harald Unties the Elves by paying ({2} magic symbol) ({B} magic symbol) ({G} magic symbol) , causing it to enter the battlefield with a lore counter on it.
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.
Moritte of the Frost's first chapter ability triggers, holding priority, activate Faith Healer by sacrificing Moritte of the Frost, causing you to gain 4 life.
Resolve the Moritte of the Frost trigger, 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.