Eye of Singularity and Faerie Artisans on the battlefield.
Steps
Whenever a nontoken creature enters the battlefield under an opponent's control, Eye of Singularity and Faerie Artisans triggers.
Resolve the Eye of Singularity trigger, destroying nothing.
Resolve the Faerie Artisans trigger, creating a token copy of the creature that entered the battlefield and exiling all other tokens created by Faerie Artisans.
When the token enters the battlefield, Eye of Singularity triggers, destroying the token and all creatures that share a name with that token.
Results
Destroy all opposing creatures when they enter the battlefield.