Roughly one in every four booster packs contain a foil card, which can be of any rarity, including basic land
Adding gives you the potential for explosive turns that leave your opponents in the dust
0% Everyday Wonders 0 / 92 0.0% 0% Paradox Drive 0 / 95 0.0% 0% Pulsing Aura 0 / 206 0.0% 0% Mega Shine 0 / 87 0.0% 0% Paldean Wonders 0 / 117 0.0% 0% Fantastical Parade 0 / 206 0.0% 0% Crimson Blaze 0 / 89 0.0% 0% Mega Rising: Mega Gyarados 0 / 125 0.0% Mega Rising: Mega Blaziken 0 / 125 0.0% Mega Rising: Mega Altaria 0 / 125 0.0% 0% 0% Deluxe Pack: ex 0 / 379 0.0% Total Unique - / 3520 Total Owned - TYPES 0 / 442 Colorless 0.0% 0 / 438 Grass 0.0% 0 / 277 Fire 0.0% 0 / 480 Water 0.0% 0 / 283 Lightning 0.0% 0 / 385 Psychic 0.0% 0 / 373 Fighting 0.0% 0 / 305 Darkness 0.0% 0 / 185 Metal 0.0% 0 / 65 Dragon 0.0% RARITY 0 / 33 Crown Rare 0.0% 0 / 84 Shiny EX 0.0% 0 / 215 Shiny 0.0% 0 / 30 Immersive Rare 0.0% 0 / 234 Special Art Rare 0.0% 0 / 105 Super Rare 0.0% 0 / 271 Art Rare 0.0% 0 / 234 Double Rare 0.0% 0 / 450 Rare 0.0% 0 / 771 Uncommon 0.0% 0 / 1093 Common 0.0%

In short, whether it is suitable for PSA is easier to judge if you think not just about whether it is an expensive card, but whether it is a genre that is easily compared or where condition differences are reflected in the price
However, in the testing, this first version felt too slow, especially as I was expecting local meta to have lots of bolts, dibs and also aggression of all other kinds