Wikia

Original	First Errata
[ Magic Card ]	[ Spell Card ]
A monster equipped with this card increases its DEF by 800 points. When this card is sent from the field to the Graveyard, you can pay 500 Life Points to place it on top of your Deck.	Increase the DEF of a monster equipped with this card by 800 points. When this card is sent from the field to the Graveyard, if you pay 500 Life Points, this card returns to the top of your Deck.
MRL-004 Magic Ruler Added by Glittersword	DB1-EN004 Dark Beginning 1 Added by Pcouw

Card Errata:Horn of Light