Obsidian black is the most privileged card of Crypto .com, to get it you need to have a stake of 50,000 MCO (at the current exchange rate 25/04/2020 it is 250,000$ approx). With it, you have many advantages.
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Pros
Spotify Premium free (cashback)
Netflix free (cashback)
Amazon Prime free (cashback)
10% discount in Expedia
Exclusive Merchandise Welcome Pack
10% discount in Airbnb
Private Jet Partnership
Airport Lounge Access (+1 guest)
Card composite metal
Cons
You need to keep the coins 6 months locked up
If you withdraw the coins after 6 months, you lose almost all the benefits
The 50MCO, 500MCO and 5000MCO stake cards are better options considering the risk of the capital investment.