Effect Monsters (Japanese: 効（こう）果（か）モンスター Kōka Monsutā) are Monster Cards with an orange color border, and were first introduced in the Vol.3 booster pack. Effect Monsters necessarily have at least one card effect or condition. Fusion, Ritual, Synchro, Xyz, Pendulum, and Link Monsters can also be Effect Monsters. Some effect monsters have powerful effects, but low ATK and DEF for their Level (such as "Ancient Gear Engineer" and "Needle Burrower"). Additionally, some cards with higher ATK or DEF for their Level have negative effects (such as "Giant Kozaky" or "Giant Orc").