Machine King Prototype is a Machine Effect Monster with Attribute EARTH, Level 3, ATK 1600, DEF 1500.
Monster cards contest the field through Summons, battles, and effects—check Level/Rank/Link and Attribute for Extra Deck or searchers.
On the current TCG and OCG Forbidden & Limited lists tracked here, Machine King Prototype is Unlimited.
YGOPRODeck lists Machine King Prototype for these formats: Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Machine King Prototype appears in Battle Pack 3: Monster League (BP03-EN019) at Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Machine King Prototype is about $0.09 on Cardmarket (prices change frequently).
