Sheets are printed very quickly, which means that a lot of ink errors happen across a significant portion of a print run, resulting in many copies of the same error
I had heard of making alters of cards or proxies:
For this cost, you get a 3/4 with vigilance and haste, and you have to choose a player as they enter the battlefield

$4.99 Yuffie, Materia Hunter (0158 - Extended Art) Final Fantasy Commander Decks Variants $10.99 Auron, Venerated Guardian (0130 - Extended Art) Final Fantasy Commander Decks Variants $5.99 Krile Baldesion (0176 - Extended Art) Final Fantasy Commander Decks Variants $2.99 Heidegger, Shinra Executive (0136 - Extended Art) Final Fantasy Commander Decks Variants $5.99 Avalanche of Sector 7 (0150 - Extended Art) Final Fantasy Commander Decks Variants $4.49 Thancred Waters (0139 - Extended Art) Final Fantasy Commander Decks Variants $2.99 Umaro, Raging Yeti (0156 - Extended Art) Final Fantasy Commander Decks Variants $4.99 Strago and Relm (0155 - Extended Art) Final Fantasy Commander Decks Variants $4.99 Siegfried, Famed Swordsman (0149 - Extended Art) Final Fantasy Commander Decks Variants $0.79 Coin of Fate (0104 - Extended Art) Final Fantasy Commander Decks Variants $3.49 Sabin, Master Monk (0154 - Extended Art) Final Fantasy Commander Decks Variants $6.99 O'aka, Traveling Merchant (0144 - Extended Art) Final Fantasy Commander Decks Variants 0 results found

They grow out of the "playful" part
Sometimes an existing template can be used, but often, as with Brainstorm, a new template must be created