Simply storing them in a box or a drawer exposes them to the risk of spills, dust accumulation, and accidental creases
Or, you know, you could splash out $20 and grab yourself Gisela, the Broken Blade, who costs one more mana, nearly doubles the Thunder Bird's stats, is a legendary, and has Lifelink while also being a flying creature with first strike
Set Boosters are the most fun Streets of New Capenna boosters to open: the commons and uncommons tell little stories, there's a guaranteed foil and art card in every booster, and 30% of Set Boosters contain at least two rares or mythic rares
And hey, if you're running Raichu (whose Powerful Spark attack could end up doing some significant damage if your deck relies on Lightning Energy), this card is an adorable way to get it into play
But with Die creatures, there's an additional wrinkle: die creatures can be rerolled any time, not just when they were initially rolled