Theres one for each color, and each lets you cast them without paying their mana cost if you control a commander
Invoke Prejudice Against Other Colors of Creatures Invoke Prejudice is a Blue Enchantment that increases the casting cost of your opponents creature spells by X if its color doesnt match the color of any of your creatures in play (X is the casting cost of the creature itself.) In other words, this essentially doubles the casting cost of your opponents creature spells if they dont match the colors of the creatures you control
I could see myself playing Ashling's Command to fire a barrage of damage at an opponents board before or after combat in a pirate deck, then either draw cards or create Treasure, whichever makes most sense in the moment
List of Mutate Cards Archipelagore Auspicious Starrix Boneyard Lurker Brokkos, Apex of Forever Cavern Whisperer Chittering Harvester Cloudpiercer Cubwarden Dirge Bat Dreamtail Heron Essence Symbiote Everquill Phoenix Gemrazer Glowstone Recluse Huntmaster Liger Illuna, Apex of Wishes Insatiable Hemophage Lore Drakkis Majestic Auricorn Migratory Greathorn Mindleecher Mysterious Egg Necropanther Nethroi, Apex of Death Otrimi, the Ever-Playful Parcelbeast Pollywog Symbiote Porcuparrot Pouncing Shoreshark Regal Leosaur Sawtusk Demolisher Sea-Dasher Octopus Snapdax, Apex of the Hunt Souvenir Snatcher Trumpeting Gnarr Vadrok, Apex of Thunder Vulpikeet Zagoth Mamba The Best Mutate Cards #5
Maybe after the next set