REDU format ruling
Master Gig

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Once per turn, you can pay 1000 Life Points to destroy monsters your opponent controls equal to the number of face-up Psychic-Type monsters you control.
Rulings
- Paying 1000 Life Points is a cost to activate "Master Gig’s" effect. This effect does not target.
- You determine the number of destroyed monsters based on the number of face-up Psychic monsters you control when this effect resolves.
- If the number of monsters controlled by the opponent is less than the number of face-up Psychic monsters you control, you cannot activate "Master Gig’s" effect. If the effect has already been activated and you control more Psychic-Type monsters than your opponent has monsters when the effect resolves, you cannot destroy any of the opponent’s monsters.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.