Me promoting my gacha character from 3 stars to 4 and watching their stats go up: Oooh, big stretchy

Indulgent furry artist, character designer and cartoonist, NSFW 🔞
Me promoting my gacha character from 3 stars to 4 and watching their stats go up: Oooh, big stretchy
Wait wait back up,
Is this about Snap? Are Stars advancement, or rarity? Or are you converting one card to the rarer version of itself?
Nah, I've been playing Soul Hunters lately. The only upgrades to the cards themselves in Snap are cosmetic, though each upgrade increases your level which is usually how you get new cards.