Even if you're only looking at Commander, this allows you to put a Sol Ring directly into play, but that's probably the tamest thing you can do with this thing
Still, the entire point of equipment decks is to win with their assortment of cheap, powerful equipment cards and this card is far from cheap
The Emperor offers better card advantage, but Svyelun makes it hard for your opponents to pick off key pieces while still drawing you some cards
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
Equip (: Attach to target creature you control
