It is not a useless card because it can be used to protect union monsters that will be destroyed or monsters that can be equipped with union monsters, and can be used for continuous attacks to separate and attack union monsters after a combined attack
Evolution Result Burst Evolution Result Burst Normal Spell Add 1 "Overload Fusion" from your Deck to your hand, also any monster you Fusion Summon with "Overload Fusion" using 6 or more materials this turn can attack a number of times each Battle Phase this turn up to the number of materials used for its Summon, but you cannot Special Summon monsters for the rest of this turn after this card resolves, except with Spell effects
New Arts Card Sleeves featuring the medical machine from "Episode: Frieza Saga (Z)" are here
So you should use cards like "Gravity Bind" and "Swords of Revealing Light" to protect them from being attacked, leaving you free to inflict Battle Damage to your opponent during your turn over and over again
When "Jinzo" is on the field, the effects of all trap cards are negated
Maddie Blaustein (English) A vizier of Atem and Sugoroku's past life