The World Spell | Cloudstone Curio | Lithoform Engine (and two other cards)

Cards

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

This combo has been estimated to be Exhibition (Bracket 1+).