yugioh des deck YU-GI-OH! - Mosquito (BP02-EN076) - Battle Pack 2: War of The Giants - 1st Edition trading and collectible card game (TCG/CCG) YuGiOh 2009 Starter Deck Single

Once the Xyz monsters are in play, this is where things get very interesting

Due to the fact that PSA does not differentiate between regular Blue Back and No Number Blue Back cards true comparisons between the two are difficult, however to date while there are only 23 PSA 10 copies of the Blue Back Charizard in existence only 2 of those are confirmed as No Number variants

If you call it right, the attacking monster's ATK becomes 0 until the end of the Battle Phase

So far, this type of card has only ever been up for public auction three times, while the most expensive (sitting pretty with a PSA 10) was last sold in 2020 for a solid $236.4K

To get an understanding of the baseline of this card, imagine playing it in traditional Affinity