Nonland permanents you control can tap to produce at least ({3} magic symbol) ({U} magic symbol) ({R} magic symbol) .
({G} magic symbol) ({U} magic symbol) available.
Steps
Activate all mana-producing nonland permanents you control by tapping them, adding at least ({3} magic symbol) ({U} magic symbol) ({R} magic symbol) .
Activate Alchemist's Refuge's second ability by paying ({G} magic symbol) ({U} magic symbol) and tapping it, allowing you to cast spells this turn as though they had flash.
If nonland permanents you control can tap to produce at least ({4} magic symbol) ({U} magic symbol) ({R} magic symbol) , this combo nets infinite mana.
Results
Infinite ETB.
Infinite LTB.
Infinite magecraft triggers.
Infinite mana nonland permanents you control can produce.