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The Skull Spoiler was obtainable in Season 20: "Apocalypse" by being in the top 2% when the season ended.
Skull itself has a MU of ~190 which we can compare to spoilers such as Snow Log and T.rex bone, having a MU of ~183 and ~208 respectively. Both these spoilers are put as rare rarity so it is justifiable to put the Skull spoiler as the same rarity as the MU is in between both these spoilers. Skull is hard to spot in trades and is hoarded by a number of people with over 15 people hold over 8 of these spoilers which is around 45% off the total distribution of the item. Suggestion made by: @magic_________