For modern cards, rarity still matters, but treatment matters too
Most of the cards are suited to a specific theme, or bad enough that the average Commander player wouldnt play them, or both
Dont buy a foam brush they tend to flake and ruin the application
If the sacrificed creature was legendary, amass Orcs 2
Prismari Artistry (Blue/Red) Cast splashy spells, create elemental attackers Rootha, Mastering the Moment turns instant and sorcery cards into X/X Elementals, with bigger spells making bigger tokens
Once that's sorted, you're guaranteed 30 boosters to open, eaching containing at least 1 shiny Traditional Foil card and 14 cards of rarity Rare or higher, alongside the heart-racing possibility of finding special cards featuring beautiful borderless alternate art