Effect
While a Field Spell Card is face-up on the field, this card gains 1000 ATK.
The monster effect of "Oyakorn" is a Continuous Effect.
It is applied only while a Field Spell Card is face-up in your or your opponent's Field Zone, and its ATK increases.
Even if there are face-up Field Spell Cards in both your and your opponent's Field Zones, the ATK increase is only 1000.
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