Here are some examples of my <1% cards.
Leonin ShikariTallowispSerra AvengerKnight of Meadowgrain
Threads of DisloyaltyVedalken DismisserDraining WhelkScion of Oona
Thief of HopeKeening BansheeEnslaveEarwig Squad
Zo-Zu the PunisherGalvanic ArcMagus of the ScrollChandra Nalaar
Troll...
187 of my 360 are in less than 1% of cubes.
59 are "spicy picks"
54 are "marginal"
30 are in 5-8% of cubes
17 are "solid role players"
12 are "cube all stars"
1 is a "multi format cube staple"
Here's my list: https://cubecobra.com/cube/list/161652fe-59b7-455f-9d27-9cce39559a37
The concept is...
