Emperor of Lightning is a Thunder Effect Monster with Attribute LIGHT, Level 8, ATK 2600, DEF 2600.
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, Emperor of Lightning is Unlimited.
YGOPRODeck lists Emperor of Lightning for these formats: TCG.
A listed print of Emperor of Lightning appears in Yu-Gi-Oh! World Championship 2007 prize cards (WCPS-EN702) at Ultra Rare rarity.
Among markets shown on this page, the lowest listed snapshot for Emperor of Lightning is about $1.02 on Amazon (prices change frequently).
