[ Compétence / Terrain ]
Skill activation
At the start of the Duel, flip this card over and place it in your Field Spell Zone.
Effect
Once per turn: You can send 1 "Ojama" card from your hand to the GY; Special Summon 1 "Ojama" monster from your GY. While you control an "Ojama" monster, switch the original ATK/DEF of all monsters on the field.