There and Back Again has exactly two lore counters on it.
Sword of the Paruns attached to Ghired.
Steps
At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Activate Ghired by tapping it, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Activate three Treasure tokens by tapping and sacrificing them, adding ({3} magic symbol) .
Activate Sword of the Paruns by paying ({3} magic symbol) , untapping Ghired.
Repeat from step 3.
Notes
Once you have infinite mana, you may instead use Ghired to copy any other token(s) that entered the battlefield under your control this turn.
Once you have infinite mana, you may attach Sword of the Paruns to any other creature(s) to untap them.
Results
Infinite LTB.
Infinite ETB.
Infinite colored mana.
Infinite death triggers.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Infinite Treasure tokens.
Infinite copies of tokens you control that entered the battlefield this turn.