REDU format ruling
Gandora the Dragon of Destruction

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Cannot be Special Summoned. You can pay half your LP; destroy as many cards on the field as possible (other than this card), and if you do, banish them. This card gains 300 ATK for each card destroyed this way. Once per turn, during the End Phase, if this card was Normal or Flip Summoned this turn: Send it to the Graveyard.
Rulings
(C) This card cannot be Special Summoned. (1) You can pay half your Life Points to destroy and remove from play all other cards on the field. This card gains 300 ATK for each card destroyed this way. (2) This card is sent to the GY during the End Phase of the turn it was Summoned.
- The (C) Condition cannot be negated. This is not an effect.
- The (1) Ignition Effect does not target.
- This effect resolves sequentially: destroy and remove from play all other cards on the field, then Gandora gains 300 ATK for each card destroyed.
- Cards destroyed by this effect are removed from play face-up.
- You cannot activate this effect if there are no other cards on the field.
- You can activate this effect more than once per turn.
- Token Monsters destroyed & removed from the field by this effect are counted for the ATK increase.
- VS. Book of Moon/Enemy Controller: if Gandora the Dragon of Destruction is flipped face-down, or your opponent gains control of it, it is not destroyed by this effect and remains on the field.
- VS. Imperial Iron Wall: This effect cannot activate while Imperial Iron Wall is active. If Imperial Iron Wall is chained to Gandora's effect, other cards are still destroyed and sent to the GY.
- The (2) mandatory Trigger Effect activates during the End Phase.
- This effect activates regardless of who controls this card during the End Phase.
- If Gandora is removed from play by Interdimensional Matter Transporter the turn it was Normal Summoned: this effect will activate after it returns to the field during the End Phase.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.