As a general rule, any sort of full-art card with a popular character on the front will be worth something
These are: Monsters Left Arm of the Forbidden One Right Arm of the Forbidden One Left Leg of the Forbidden One Right Leg of the Forbidden One Chronograph Sorcerer Double Iris Magician Predaplant Ophrys Scorpio Supreme King Dragon Darkwurm Altergeist Multifaker Dinowrestler Pankratops Orcust Harp Horror Thunder Dragonhawk Salamangreat Gazelle Girsu, the Orcust Mekk-Knight Exodia the Forbidden One Cyber Stein Morphing Har Night Assailant Armageddon Knight Genex Ally Birdman Tempest, Dragon Ruler of Storms Luster Pendulum, the Dracoslayer Speedroid Terrortop SPYRAL Quick-Fix Astrograph Sorcerer Wind-Up Carrier Zenmaity Toadally Awesome Zoodiac Drident True King of All Calamities Divine Arsenal AA-ZEUS Sky Thunder Blaze Fenix, the Burning Bombardment Bird ABC-Dragon Buster Thunder Dragon Colossus Trishula, Dragon of the Ice Barrier T.G
Whatever Wizards adds to the set will be a near-permanent part of Standard Magic
Bolas soon learned he would not be the only visitor upon the Metal Island though
However, it is Limited on the OCG List
Thus, if you have 1 monster on the field, the opponent cannot have more than 1 monster at any time