When Gnawing Vermin enters the battlefield, target player mills (To mill a card, a player puts the top card of their library into their graveyard.) two cards.
When Gnawing Vermin dies, target creature you don't control gets -1/-1 until end of turn.
The information presented on this site about Magic: The Gathering, both literal and graphical, is copyrighted by Wizards of the Coast.
This website is not produced, endorsed, supported, or affiliated with Wizards of the Coast.