The problem is, it only works if you control five or more characters with a cost of 5 or higher
How to Perform the Test: Take your loupe and look closely at the card title or the rules text on the front of the card
Although Cannon Soldier has a very similar effect and was banned for largely the same reason, Mass Driver has the advantage of being a Spell Card that doesn't take up a Normal Summon, meaning Frog decks were able to take full advantage of its burn effect the turn it was played
In Japan, this card was released in the Eevee Heroes set and initially its Japanese version was significantly more expensive than the English edition from Evolving Skies
Sadly the more expensive convoke spells are really only playable in token themed decks and so despite there being a lot of convoke cards on offer fairly few of them are relevant for cube for being too narrow
However, another one is currently on sale at Fanatics Collect for a whopping $120,000, while an eBay seller has it listed at $189.995