All CONMEBOL Libertadores player items are Rare and will count as Rare whenever Rare players are asked for in a Squad Building Challenge. Even if a player's base item was Bronze, Silver or Gold Common, the corresponding CONMEBOL Libertadores item will be Rare.
Re: Libertadores Cards do not count as rares in the Icon SBC's Bronze&silver. +1 and this is a major bug. These cards take up rare slots in packs that EA sells and advertises as having guaranteed rares, and they are absolutely defective because they don't work as rares in the majority of icon SBCs.