Myojin of Cryptic Dreams has at least two indestructible counters on it.
({4} magic symbol) ({B} magic symbol) available.
Steps
Cast Gulping Scraptrap by paying its mana cost.
Holding priority, activate Myojin by removing an indestructible counter from it, copying the Gulping Scraptrap spell three times.
Resolve the first Gulping Scraptrap spell.
When the Gulping Scraptrap token enters the battlefield, it triggers, putting an indestructible counter on Myojin.
Repeat from step 2.
Notes
This combo results in infinite copies of the Gulping Scraptrap spell on the stack, which you can then resolve to infinitely proliferate. This can put infinite indestructible counters on Myojin to infinitely copy any permanent spell(s) you cast in the future.
Results
Infinite ETB.
Infinite creature tokens.
Infinite proliferate.
Infinite copies of any permanent spells you control.