REDU format ruling
Chain Energy

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Each player must pay 500 Life Points per card to Normal Summon, Special Summon, Set or activate cards from his/her respective hand.
Rulings
- Chain Energy applies only to cards played or Set from your hand, not cards that are activated when already Set on the field, or to cards placed onto the field by effects like Cyber Jar’s Flip Effect.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.