Harald Unites the Elves + Moritte of the Frost + Thaumatog

Prerequisites

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Steps

1. 1Cast Harald Unties the Elves by paying , causing it to enter the battlefield with a lore counter on it.
2. 2Harald 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. 3Moritte of the Frost's first chapter ability triggers, holding priority, activate Thaumatog's second ability by sacrificing Moritte of the Frost, giving it +1/+1 until end of turn.
4. 4Resolve 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.
5. 5Repeat from step 3.

Effects

• Infinite self-mill
• Infinitely large creature until end of turn