REDU format ruling
Sword of Sparkles

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Equip only to an "X-Saber" monster. If it destroys an opponent's monster by battle, you can destroy 1 card your opponent controls. You can Tribute 1 monster you control to return this card from your Graveyard to the top of your Deck.
Rulings
- Tributing 1 monster is a cost to activate the effect to return "Sword of Sparkles" to your Deck. If "Sword of Sparkles" is equipped to a monster that is unaffected by Spells, the effect to destroy 1 card your opponent controls still applies. Both effects of this card start a Chain.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.