REDU format ruling
Royal Swamp Eel

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)If this card is used as a Synchro Material Monster, all the other Synchro Material Monsters must be Fish-Type.
Rulings
- The Ⓒ is a condition. It can't be negated.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.