The equipped monster gains 400 ATK. If the equipped monster attacks a Defense Position monster, inflict piercing battle damage to your opponent. When this card leaves the field, banish the equipped monster.
If you equip your Big Bang Shot to your opponent's Dark Magician, and Dark Magician attacks your Jerry Beans Man, the opponent of the owner of the "Big Bang Shot" takes the damage (so your opponent, who attacked with Dark Magician, takes 2900 points of damage).
* The [Big Bang Shot] was equiped from the opponents side, while the equiped monster was on the opponents (yours).
* The equiped monster attacked and dealt piercing (spell) damage to the attacker.
If that's the case, I think it's no bug. It seem to count as Spell damage and benefits the owner of the spell card. That's my take on it. Regardless, that's how it functions.
Hi. What about comparing this card with shield spear? Shield spear is more versatile, helping in def and attack. The pierce effect is overkill in imo (if you are attacking, u are on upper hand usually), the equip banish effect is very situational and need another card to work.
Also to note: if you plan on chaining a spell removal card to the activation of this card, it will not do anything as the card has not yet fully resolved
You can also try other cheeky plas with this card too; use it with Tailor of the Fickle to change the target to your opponent if they were to destroy your equip but that would be it's only real use as equips are starting to die out. Just a fun combo if you plan on building a deck with at least 2 of these