REDU format ruling
Theban Nightmare
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Gains 1500 ATK while you have no cards in your hand nor in your Spell & Trap Zones.
Rulings
- If you have only Kuriboh in your hand, and no Spell or Trap Cards on the field, and your Theban Nightmare battles with a card that has higher ATK/DEF, and you discard Kuriboh, the ATK of Theban Nightmare is increased by 1500 AFTER damage calculation (but Theban Nightmare is still destroyed by damage calculation unless an effect like Waboku had been activated previously during the turn).
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.