Thoughts within the Sword (S-CBT03/0064EN) (S-CBT03)

[Set] (This card remains on the field)
Souls of all "Messiah Arms" on your field cannot be dropped by your opponent's card effects.
[Counter] [Act] During each player's attack phase, choose a card with "Dragon" in its attribute on your opponent's field, and you may drop a "Messiah Arms" from your hand. If you do, put the chosen card to drop zone. You may only use this ability once per turn.