Not only does each provide protection, but the sleeves perfectly fit the cards and the sleeved cards perfectly fits the top loaders
When it enters the battlefield, look at the top 9 cards of an opponent's library and steal 2 of them, it's basically like having Super Dig on a creature
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
Blinking your entire board then re-entering to generate more tokens can set up a lethal board state, especially if you cast it on the end step before your turn
Given the life loss is just half of their current total, Ive often seen people with 4 or 5 life starting it, and its a lot of hoops to jump through to save yourself from taking a few life
Sire of Seven Deaths is a giant Eldrazi that helps you to stabilize your board, and it fits into every deck interested in playing a 7-drop, especially in colors that want to gain life and cant (, mostly)