Minecraft wiki entry for Evoker, associated text: While the evoker is not engaged in combat and /gamerule mobGriefing is set to true, it changes the wool color of any blue sheep within 16 blocks from blue to red. It signals the spell by producing orange particles () and making a "wololo" sound. This spell resets the evoker's spell cooldown to three seconds, and resets the cooldown for the sheep color conversion spell to seven seconds.