You open a Standard Token and are thrilled when you see gold, and even more thrilled when you realize it’s Thanos. Then you realize it’s purple, and at 2/5/2 it’s completely useless to you.
Then later on that day you get a bonus hero of Thanos and are thrilled only to realize that it’s purple again.
You could always buy those other colors you need at the bargain basement price of 80CP and then champ him, using those extra covers to obtain a Legendary Token worth… waitaminute here…