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*This monster could possibly be the antithesis to "[[Treeborn Frog]]". While "Treeborn Frog" looks angelic with wings and a halo, "[[Swap Frog]]" has two horns that are usually depicted on demons. He also has a tight card combo with "Treeborn Frog". The word "Oni" can refer to many things: Ogre, Troll, Demon or Curse/Maledict.
** The devil theme is also emphazise in its effect since it can send an [[Aqua| Aqua-type]] monster to the grave when it's summoned.
