The text doesn't actually say "opponent's" attacking monster in game. It just says 1 attacking monster. This card SHOULD let you use it on your own monsters but it doesn't work. Either the game needs to fix the text or fix the card.
It's a trap card. Why would it be anything other than an opponent attack?
What the heck...if you chain two enchanted javelins together you get a net LP gain. I started at 4000 LP was attacked by 2400 atk monster. Two enchanted javelins later and my LP is 6400. Is this a bug?
Does this card cancel the attack? Like if I activate this do I gain the health and the monster that attacked does not attack or the attacking monster or does it technically make it so I take 0 damage by increasing my health of the attacking monster and instantly loosing it when you take attack damage.
try it out, it doesnt cancel the atack, but it will heal you for the total atk damage, so if u have a defense position monster you will heal, if you got nothing on the field it will be like nothing happened