Advanced format ruling
Energy Drain
Card effect (current official text)Target 1 face-up monster you control; it gains 200 ATK/DEF for each card your opponent currently has in their hand, until the end of this turn.
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.