As an art enthusiast who loves spending time browsing cards I've noticed that only the OTG artwork of the Stim-Pack card (featuring the red liquid) is available in the game. Think it would be aesthetically appealing if the TCG version (featuring the green liquid) which is currently missing is also included in the card list
Both versions can be seen here:
https://yugioh.fandom.com/wiki/Card_Artworks:Stim-Pack
dispersus