The World Spell + Cloudstone Curio + Lithoform Engine + Estrid's Invocation + Altar of the Brood

Prerequisites

• The World Spell has exactly two lore counters on it.
• You have at least one non-Saga enchantment card in hand.

Steps

1. 1At the beginning of your precombat main phase, The World Spell triggers, putting a lore counter on itself.
2. 2The World Spell's third chapter ability triggers.
3. 3Holding priority, activate Lithoform Engine's first ability by paying and targeting it, copying The World Spell's trigger.
4. 4Resolve the copy of The World Spell's trigger, putting Estrid's Invocation and any non-Saga enchantment onto the battlefield from your hand.
5. 5Choose to have Estrid's Invocation enter the battlefield as a copy of The World Spell, with three lore counters due to its read-ahead ability.
6. 6Estrid's Invocation triggers once, and Cloudstone Curio and Altar of the Brood each trigger twice.
7. 7Resolve both Altar of the Brood triggers, causing each opponent to mill two cards.
8. 8Resolve both Cloudstone Curio triggers, returning Estrid's Invocation and any other non-Saga enchantment from the battlefield to your hand.
9. 9Resolve the Estrid's Invocation trigger, putting it and the non-Saga enchantment onto the battlefield from your hand.
10. 10Repeat from step 5.

Effects

• Infinite mill