Orvar, the All-Form + Gilded Lotus + Bösium Strip + Clockspinning Combo

Clockspinning in hand.

All other permanents on the battlefield.

available

Activate Gilded Lotus by tapping it, adding .

Activate Bösium Strip by paying and tapping it, allowing you to cast instant and sorcery spells from your graveyard this turn.

Cast Clockspinning by paying , targeting Gilded Lotus.

Orvar's first ability triggers, creating a token copy of Gilded Lotus.

Resolve Clockspinning, putting it into your graveyard.

Activate the Gilded Lotus token by tapping it, adding .

Cast Clockspinning from your graveyard with buyback by paying , targeting Gilded Lotus.

Orvar's first ability triggers, creating a token copy of Gilded Lotus.

Resolve Clockspinning, returning Clockspinning to your hand.

Activate the Gilded Lotus token by tapping it, adding .

Repeat from step 3.

Once you have infinite mana, you may instead target any other applicable permanent.

Infinite artifact ETB

Infinite colored mana

Infinite copies of permanents you control

Infinite creature tokens

Infinite creature ETB

Infinite landfall triggers

Infinite magecraft triggers

Infinite proliferate

Infinite storm count