Like most Pokmon cards, the value of Nidoking BREAK depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Evolutions)
No matter what color the creature is, no matter if its an artifact or not, the creature will die (with or without regenerate)

The nine cards that refer to playing for ante. The seven cards banned by WotC as racially or culturally offensive. Ancestral Recall Balance Black Lotus Channel Chaos Orb Dockside Extortionist Emrakul, the Aeons Torn Erayo, Soratami Ascendant Falling Star Fastbond Flash Golos, Tireless Pilgrim Griselbrand Hullbreacher Iona, Shield of Emeria Jeweled Lotus Karakas Leovold, Emissary of Trest Library of Alexandria Limited Resources Lutri, the Spellchaser (banned as a companion, legal for regular gameplay and as a commander) Mana Crypt Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Nadu, Winged Wisdom Paradox Engine Primeval Titan Prophet of Kruphix Recurring Nightmare Rofellos, Llanowar Emissary Shahrazad Sundering Titan Sylvan Primordial Time Vault Time Walk Tinker Tolarian Academy Trade Secrets Upheaval Yawgmoths Bargain Legacy Banned Cards The 25 cards with the Conspiracy type
(Green and Red Starter Deck)
New Trainer Trials are being added
Blue doesnt often get trample, but when it does, it is evidently a game-changer