Advanced format ruling
Cyberdark Horn
Card effect (current official text)If this card is Normal Summoned: Target 1 Level 3 or lower Dragon monster in your GY; equip that Dragon monster to this card. Gains ATK equal to the original ATK of the monster equipped to it by this effect. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card would be destroyed by battle, destroy the monster equipped to it by its effect, instead.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.