Orvar and Spark Double on the battlefield (Spark Double as a copy of Orvar).
You control an Island that enters the battlefield untapped.
({6} magic symbol) plus six.
({U} magic symbol) available.
Steps
Cast Mind Games with buyback by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting Spark Double.
Orvar triggers, creating a token copy of Spark Double that enters the battlefield as a nonlegendary token copy of Orvar.
Resolve Mind Games, returning it to your hand.
Cast Mind Games with buyback by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting Spark Double.
Orvar and the Spark Double token trigger, creating two token copies of Spark Double that enters the battlefield as a nonlegendary token copy of Orvar.
Resolve Mind Games, returning it to your hand.
Cast Mind Games with buyback by paying ({2} magic symbol) ({U} magic symbol) ({U} magic symbol) , targeting any Island that enters the battlefield untapped.
Orvar, Spark Double and the three Spark Double tokens trigger, creating five token copies of the Island.
Resolve Mind Games, returning it to your hand.
Activate four of the Island tokens by tapping them, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Repeat from step 7.
Once you have infinite mana, you can then target any artifact, creature or land using Mind Games to get infinite tokens of them.
Results
Infinite copies of artifacts, creatures and/or lands you control.