This is now horrendous value, and a bit shady tbh, as it's included as part of the pre-order.

I could be wrong, but this feels like taking advantage of the current situation. https://twitter.com/SaffronOlive/status/1247250384776826884

Okay there's a Reddit thread on the value analysis of the Mastery set, and it's not looking good.

I also feel for whichever member of WotC had to respond in this thread - they got it pretty bad. https://www.reddit.com/r/MagicArena/comments/fw27h4/iko_mastery_pass_value_analysis/