Such fillers are apparently sometimes used in other TCGs (see The Collation Project on the topic of Magic: The Gathering) and are discarded after cutting (though I wouldnt be surprised if there are Jungle packs accidentally containing a blank card out there somewhere)
Sure, the Thunderbolt attack is quite expensive at three Lightning Energy, but when there's a need for a surefire attack, it's the only real option
It's not impossible to get the firepower of a one-hit kill
a Fake "Thunder Nyan Nyan", the only authentic asset in this card is its OCG Artwork, has an extra 1 digit in each of ATK/DEF, Incorrect template, Attribute, Level, and text, incorrect arabic
Cards like Prismatic Secret Rare or Ultimate Rare often hold higher resale value, making them sought-after for both collectors and investors globally