|This J-Ruler is the J-activated side of .|
|Undine, the Spirit|
|ATK/DEF:||1000 / 1000|
|Abilities:|| [Enter] Return target two resonators to their owner's hand.
[Activate] Discard two cards from your hand : Put "Leviathan, the Tyrant of Ocean" card into your field from your hand. This triggers [Enter] ability of that card.
|Sets and Rarity:|
| [Valhalla Cluster] Starter Deck : Royal Palace of the Roaring Seas
[Valhalla Cluster] The Dawn of Valhalla