Kaiba is known for having huge and high cost monsters like his signature card Blue-Eyes White Dragon. This is one of his exclusive skills which enables him to back up his low level monsters ATK power after summoning high level monsters.
Boosts the ATK of face-up attack position monsters you control by 300 per level 5 or more monsters you control. You can only use the skill once per turn.
Just because a skill has competitive use does not mean it should be nerfed lol
I still dont understand why this is not a passive skill? Its a attack boost that can be used every turn. Why would anyone skip using it every turn? It's just ilogical to be necessary to activate it! It should be passive so I could let it play better on auto duel and save time.