All permanents on the battlefield (Spark Double as a copy of Minn).
({2} magic symbol) available.
Steps
Activate Nykthos's second ability by paying ({2} magic symbol) and tapping it, adding at least ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Activate Meloku by paying ({1} magic symbol) and returning Nykthos from the battlefield to your hand, creating a 1/1 Illusion creature token.
Activate High Market's second ability by tapping it and sacrificing the Illusion.
When the Illusion dies, Spark Double and Minn's second abilities trigger.
Holding priority, activate Meloku by paying ({1} magic symbol) and returning High Market from the battlefield to your hand, creating a 1/1 Illusion creature token.
Resolve the Spark Double and Minn triggers, putting Nykthos and High Market from your hand onto the battlefield.
Repeat.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite colorless mana.
Infinite creature tokens.
Infinite landfall triggers.
Infinite mana among colors with which you have devotion.