You can only control 1 "Noble Arms - Gallatin". Equip only to a Warrior-Type monster. It gains 1000 ATK. During each of your Standby Phases, it loses 200 ATK. If this face-up card on the field is destroyed and sent to the Graveyard: You can target 1 Warrior-Type "Noble Knight" monster you control; equip this card to that target. You can only use this effect of "Noble Arms - Gallatin" once per turn.
When the debuff has already equalled or exceeded the boost, you can use Reverse Trap to switch both values.
Use these cards to search out Noble Arms cards from your deck. Noble Knight Bedwyr sends Noble Arms to the graveyard when he is summoned, you can then equip that Noble Arms card from your graveyard to a Noble Knight monster with Bedwyr’s effect.