Activate Olivia's first ability by paying ({1} magic symbol) ({R} magic symbol) , dealing 1 damage to a creature an opponent controls, destroying it due to Olivia's deathtouch, and putting two +1/+1 counters on Olivia.
When the creature dies, Revel in Riches' first ability triggers, creating two Treasure artifact tokens.
Activate the Treasures by tapping and sacrificing them, adding ({1} magic symbol) ({R} magic symbol) .
Repeat from step 2.
If you have a way to give Olivia deathtouch indefinitely, you may repeat this loop whenever a creature enters the battlefield under an opponent's control.
Results
Destroy all creatures opponents control.
Destroy all creatures that enter the battlefield under an opponent's control.