Edison 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.
Rulings
- The last effect of this card ("…the equipped monster is destroyed instead") happens at the end of the Damage Step, at the time that this monster would normally be sent to the GY.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.