In fact every card you summon in the game is technically a monster although some of them looks quite cute and lovable
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
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
And, sadly, most support for Spirit Monsters is aimed at bypassing their unique mechanic rather than supporting the mechanic
Conclusion: Is it Worth Grading Pokemon Cards Whether youre looking to increase the value of your cards, or simply protect them, I believe grading Pokemon cards is indeed worth it