Trample
Splinterfright's power and toughness are each equal to the number of creature cards in your graveyard.
At the beginning of your upkeep, mill two cards.
If Splinterfright’s controller has only one card in their library, they put that card into their graveyard.
The ability that defines Splinterfright’s power and toughness works in all zones, not just the battlefield. If Splinterfright is in your graveyard, it will count itself.