There and Back Again + Twinflame + Skullwinder Combo

Twinflame in hand.

There and Back Again and Skullwinder on the battlefield (There and Back Again with exactly two lore counters on it on the battlefield).

available

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.

Cast Twinflame by paying , creating a token copy of the Smaug token and Skullwinder with haste.

Put either Smaug token into your graveyard due to the legend rule.

The Smaug token that died and the Skullwinder token trigger.

Resolve the Smaug trigger, creating fourteen Treasure tokens.

Resolve the Skullwinder trigger, returning Twinflame from your graveyard to your hand.

Activate five Treasures by tapping and sacrificing them, adding .

Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite artifact tokens

Infinite creature LTB

Infinite creature ETB

Infinite colored mana

Infinite death triggers

Infinite storm count

Infinite magecraft triggers

Infinite Treasure tokens

Target opponent returns all cards in their graveyard to their hand

Infinite copies of creatures you control with haste