You have enough mana to cast the buyback spell with buyback.
Opponents control a number of artifacts and/or enchantments equal to or greater than one plus the number of Treasure tokens that would be required to cast the buyback spell with buyback.
There are legal targets for the buyback spell, if applicable.
Steps
Cast the buyback spell with buyback by paying its mana cost plus its buyback cost.
Displacer Kitten triggers, blinking
Dockside Extortionist.
When
Dockside Extortionist enters the battlefield, it triggers, creating a number of Treasure artifact tokens equal to the number of artifacts and/or enchantments opponents control.
Resolve the buyback spell, performing its listed effect and returning it to your hand.
Activate a Treasure by tapping and sacrificing it, adding one mana of any color.
Repeat step 5 until you have enough mana to cast the buyback spell with buyback.
Repeat from step 1.
Results
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite artifact tokens.
Infinite blinking of nonland permanents.
Infinite colored mana.
Infinite creature ETB.
Infinite creature LTB.
Infinite magecraft triggers.
Infinite storm count.
Infinite Treasure tokens.
Metadata
In 1851 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Not Legal (Bracket N/A).