REDU format ruling
Chain Thrasher

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)This card can attack 1 additional time during the same Battle Phase for each "Chain Thrasher" in your Graveyard.
Rulings
- When this card makes an additional attack, the opponent can activate "Disappear" to remove the other "Chain Thrasher" from the GY, and the attack stops. Do not proceed to the Damage Step.
- If you have 1 "Chain Thrasher" in the GY and 1 on the field equipped with "Twin Swords of Flashing Light – Tryce", its still only gets 2 attacks.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.