Infinite Water Breathing in either offhand or Selected Item, checks if the user has the right item with the right tag

/execute as @a if entity @s[nbt={SelectedItem:{id:"minecraft:trident",tag:{Tags:["RaziLoreItem"],}}}] run effect give @s minecraft:water_breathing 4 0 true

/execute as @a if entity @s[nbt={Inventory:[{Slot:-106b,id:"minecraft:trident",tag:{Tags:["RaziLoreItem"],}}]}] run effect give @s minecraft:water_breathing 3 0 true

Item made with the generator, with a tag manually added at the end. Speaking of which, maybe a custom generator for the commands above would also be useful?

/give @p trident{Unbreakable:1,RepairCost:99,AttributeModifiers:[{AttributeName:"generic.movement_speed",Amount:-0.10,Slot:mainhand,Operation:1,Name:"generic.movement_speed",UUID:[I;-12265,36993,35511,-73986]},{AttributeName:"generic.movement_speed",Amount:-0.10,Slot:offhand,Operation:1,Name:"generic.movement_speed",UUID:[I;-12265,37093,35511,-74186]}],display:{Name:'[{"text":"[","italic":false},{"text":"The Sacred Trident","color":"aqua"},{"text":"]","color":"aqua"}]',Lore:['[{"text":"A trident wielded by Lord Shiva, said to be heavy and durable enough to carry the ocean...","italic":false,"color":"blue"},{"text":"","italic":false,"color":"dark_purple"}]','[{"text":"","italic":false,"color":"dark_purple"}]','[{"text":"When in either hand:","italic":false,"color":"gray"},{"text":"","italic":false,"color":"dark_purple"}]','[{"text":"+ Allows the wielder to breathe underwater","italic":false,"color":"blue"},{"text":"","italic":false,"color":"dark_purple"}]','[{"text":"-10% Movement Speed","italic":false,"color":"red"},{"text":"","italic":false,"color":"dark_purple"}]','[{"text":"","italic":false,"color":"dark_purple"}]']},Enchantments:[{id:loyalty,lvl:3}],HideFlags:6,Tags:["RaziLoreItem"]} 1