There and Back Again with exactly two lore counters on it).
Mana Needed
({6} magic symbol) ({BP} magic symbol) available.
Steps
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.
Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , untapping all creatures you control and causing you to get an addditional combat and main phase after this one.
Repeat from step 2.
Results
Infinite LTB.
Infinite ETB.
Infinite colored mana.
Infinite death triggers.
Infinite combat phases.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Infinite Treasure tokens.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).