Having the option of turning your random value artifact into an attacker gives it a greater breadth of targets since it can copy things that want to attack as well as cards with strong static abilities
For example, if you control an Omnath, Locus of Creation and make a nonlegendary copy of it with Irenicus's Vile Duplication, you can use regular copy effects on the new token to skirt the legend rule
Arcane Proxy Arcane Savant Blue Mage's Cane Capricious Hellraiser Demilich Elite Arcanist Exit Through the Grift Shop Eye of the Storm Flawless Forgery Founding the Third Path Garth One-Eye God-Eternal Kefnet Isochron Scepter Jacob Frye Jund 'Em Out (playtest) Kaervek, the Punisher Maelstrom Archangel Avatar Magar of the Magic Strings Mizzix's Mastery Mizzix's Mastery Myra the Magnificent Mysterious Stranger Narset, Enlightened Exile Nashi, Moon's Legacy Panoptic Mirror Psionic Ritual Pyromancy 101 (playtest) Reenact the Crime Renegade Bull Reversal of Fortune Roving Actuator Saruman of Many Colors Shiko, Paragon of the Way Signature Spells Soundwave, Sonic Spy Spellbinder Spellweaver Helix Spellweaver Volute Surge to Victory Wildfire Devils Wizard's Spellbook Wondrous Crucible
It also introduces a new design for full-art shiny variants
But, it is a Wolf, which could be relevant when Innistrad arrives in a couple months, and the enchantment does so much else that you can afford a less exciting creature