Rydia, Summoner of Mist | There and Back Again | Barbara Wright (and two other cards)

Cards

All permanents on the battlefield (
Rydia without summoning sickness,
There and Back Again with exactly two lore counters on it, and
Sword of the Paruns attached to
Rydia).

At the beginning of your precombat main phase,
There and Back Again triggers, putting a lore counter on it and triggering its third chapter ability, creating a 6/6 Smaug legendary creature token and sacrifice
There and Back Again.
Activate
Rydia by paying ({5} magic symbol) and tapping it, returning
There and Back Again from your graveyard to the battlefield with a finality counter on it. As
There and Back Again enters the battlefield, choose to have it enter with three lore counters due to its read-ahead ability.
There and Back Again's third chapter ability triggers. Holding priority, activate
Hex Parasite by paying ({1} magic symbol) ({BP} magic symbol) , removing the finality counter from
There and Back Again.
Resolve the
There and Back Again trigger, creating a 6/6 Smaug legendary creature token and sacrifice
There and Back Again.
Put a Smaug token into your graveyard due to the legend rule, triggering its ability, creating fourteen Treasure tokens.
Activate ten Treasures by tapping and sacrificing them, adding ({9} magic symbol) ({B} magic symbol) .
Activate
Sword of the Paruns by paying ({3} magic symbol) , untapping
Rydia.
Repeat from step 2.

Once you have infinite mana, you may attach
Sword of the Paruns to any other creature(s) to untap them.

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