Royal Swamp Eel is a Fish Tuner Monster with Attribute WATER, Level 4, ATK 1700, DEF 1200.
Monster cards contest the field through Summons, battles, and effects—check Level/Rank/Link and Attribute for Extra Deck or searchers.
On the current TCG and OCG Forbidden & Limited lists tracked here, Royal Swamp Eel is Unlimited.
YGOPRODeck lists Royal Swamp Eel for these formats: Duel Links, Edison, TCG, OCG, Master Duel.
A listed print of Royal Swamp Eel appears in Crimson Crisis (CRMS-EN086) at Super Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Royal Swamp Eel is about $1.52 on Cardmarket (prices change frequently).
