Mucus Yolk is a Aqua Effect Monster with Attribute DARK, Level 3, ATK 0, DEF 100.
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, Mucus Yolk is Unlimited.
YGOPRODeck lists Mucus Yolk for these formats: GOAT, OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Mucus Yolk appears in Dark Beginning 2 (DB2-EN213) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Mucus Yolk is about $0.21 on Cardmarket (prices change frequently).
