Land of the Ojamas (SGX1-ENS03) - Speed Duel GX: Duel Academy Box 1st Edition

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.