You would receive nothing at the Cosmo. I was trying to think of the best analogy for this question and this is the best that I could come up with. Since we're all CET players think of it as a companion seven star card. With that you can access the Diamond lounges, skip registration and restaurant lines, VIP valet parking and get special cocktails etc.. But you are not able to receive all the best benefits of the 7* program. Such as invites to events, gifts and free hotel rooms.
With this "pseudo" black card you'll be able to get all the soft benefits at the various Tropicana properties. But will be unable to receive the cosmo /cruise packages available to Black Card holders.