Dual Nature

Whenever a nontoken creature enters, its controller creates a token that's a copy of that creature. Whenever a nontoken creature leaves the battlefield, exile all tokens with the same name as that creature. When this enchantment leaves the battlefield, exile all tokens created with this enchantment.

From Magic: The Gathering.

Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6od41395rppb1hohdzdlqb.