Monoskelion in exile (exiled by Agatha's Soul Cauldron).
All other permanents on the battlefield.
Garza Zol has at least one +1/+1 counter on it.
You have a way to give Garza Zol deathtouch.
({1} magic symbol) available.
Steps
Give Garza Zol deathtouch, if needed.
Activate Garza Zol using Monoskelion's ability by paying ({1} magic symbol) and removing a +1/+1 counter from it, dealing 1 damage to a creature an opponent controls.
The creature dies as a state-based action due to Garza Zol's deathtouch.
Garza Zol and Revel in Riches' first abilities trigger.
Resolve the Garza Zol trigger, putting a +1/+1 counter on itself.
Resolve the Revel in Riches trigger, creating a Treasure artifact token.
Activate the Treasure by tapping and sacrificing it, adding ({1} magic symbol) .
Repeat from step 2.
You may also repeat this combo whenever a creature enters the battlefield under an opponent's control if you can give Garza Zol deathtouch indefinitely.
Results
Destroy all creatures opponents control.
Destroy any creature that enters the battlefield under an opponent's control.