Advanced Crystal Beast Emerald Tortoise

[ Aqua / Effect ] If "Advanced Dark" is not in the Field Zone, send this monster to the GY. Once per turn (Quick Effect): You can target 1 face-up monster on the field; change its battle position. If this face-up card is destroyed in a Monster Zone, you can place it face-up in your Spell & Trap Zone as a Continuous Spell, instead of sending it to the GY. ATK/ 600 DEF/ 2000