Utopia Mycon has at least two spore counters on it.
Thornbite Staff and Illusionist's Bracers attached to Vorel of the Hull Clade.
Vorel of the Hull Clade does not have summoning sickness.
({G} magic symbol) ({U} magic symbol) available.
Steps
Activate Vorel of the Hull Clade by paying ({G} magic symbol) ({U} magic symbol) and tapping it, targeting Utopia Mycon.
Illusionists's Bracers triggers, copying Vorel of the Hull Clade's ability, targeting Utopia Mycon.
Resolve the copy of Vorel of the Hull Clade's ability, doubling the number of counters on Utopia Mycon.
Resolve the original Vorel of the Hull Clade ability, doubling the number of counters on Utopia Mycon.
Activate Utopia Mycon's first ability by removing three spore counters from it, creating two 1/1 Saproling creature tokens.
Activate Utopia Mycon's second ability twice by sacrificing the Saprolings, adding ({G} magic symbol) ({U} magic symbol) .
When the Saporlings die, Vorel of the Hull Clade triggers twice, untapping it.
Repeat.
If Utopia Mycon has three or more spore counters on it to begin the combo, this combo nets infinite spore counters on Utopia Mycon, which you may remove for infinite Saproling tokens and/or colored mana, or target another creature using Vorel of the Hull Clade.
Results
Infinite colored mana.
Infinite creature tokens.
Infinite death triggers.
Infinite ETB.
Infinite LTB.
Infinite proliferate for artifacts, creatures, and lands.