REDU format ruling
Butterfly Dagger - Elma

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)The equipped monster gains 300 ATK. When this card is destroyed and sent to the Graveyard while equipped: You can return this card to the hand.
Rulings
- If the monster that Butterfly Dagger - Elma is equipped to is destroyed as a result of battle, or by a card effect like Sakuretsu Armor or Fissure, then Butterfly Dagger - Elma cannot return to your hand because it is no longer equipped to a monster. However, if the monster and the Butterfly Dagger - Elma are destroyed simultaneously by a card like Final Destiny, then you can return it to your hand.
- While Imperial Order is active, if Butterfly Dagger - Elma is destroyed and sent to the GY, it can return to your hand.
- When Butterfly Dagger - Elma is sent to the GY without being destroyed, such as with Woodland Sprite, it cannot return to your hand.
- If Butterfly Dagger - Elma is negated and destroyed by Ryu Senshi or Freed the Matchless General, it cannot return to your hand.
- If Butterfly Dagger - Elma is destroyed during the Damage Step, such as by the effect of Cliff the Trap Remover, you cannot activate the effect that returns Butterfly Dagger - Elma to the hand.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.