Advanced format ruling
Gem Flash Energy
Card effect (current official text)During each of your Standby Phases, inflict damage to your opponent equal to the number of face-up Continuous Spell Cards on the field x 300.
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.