Advanced format ruling
Skull Lair
Card effect (current official text)Remove from play any number of Monster Cards in your Graveyard to destroy 1 face-up monster on the field whose Level is equal to the number of the cards you removed from play.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.