Advanced format ruling
Star Blast
Card effect (current official text)Pay any number of Life Points in multiples of 500; reduce the Level of 1 monster you control or that is in your hand by 1 for each 500 Life Points you paid, until the End Phase.
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.