Advanced format ruling
Psychic Commander
Card effect (current official text)When a Psychic-Type monster you control battles, during the Damage Step you can pay Life Points in multiples of 100 (max. 500) to have the monster it's battling lose that much ATK and DEF, 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.