REDU format ruling
Theinen the Great Sphinx
Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by paying 500 Life Points when both "Andro Sphinx" and "Sphinx Teleia" on your side of the field are destroyed at the same time; then you can Special Summon this monster from your hand or Deck. When this card is Special Summoned, by paying 500 Life Points, increase the ATK of this card by 3000 points until the end of the End Phase.
Rulings
- The only way you can Special Summon this card is via its trigger effect. Even if it was initially summoned that way, you still can't summon it with card effects.
- The effect to summon this card is a Trigger effect. It can activate while in the hand or Deck. You can't activate the effects of 2 or more of this card's effect in the same Chain, so you can only Summon 1 "Thenien the Great Sphinx" at a time.
- Both of this card's effects are optional, and both can can miss their timing.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.