Blocker is a Machine Normal Monster with Attribute DARK, Level 4, ATK 850, DEF 1800.
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, Blocker is Unlimited.
YGOPRODeck lists Blocker for these formats: OCG GOAT, Duel Links, Common Charity, Edison, TCG, OCG, Master Duel.
A listed print of Blocker appears in Tournament Pack 8 (TP8-EN017) at Common rarity.
Among markets shown on this page, the lowest listed snapshot for Blocker is about $0.25 on Amazon (prices change frequently).
