Aria currently has a promotion running where you will get $10 in Freeplay if you earn 25 Mlife points playing the Big Buck Hunter slot machine.  25 Mlife points is $50 of coin in.
This is running for a very limited time, but it is worth checking out. Here is a picture of the promotion sign I saw by Aria’s Mlife booth.

For more info on Mlife and Mlife points, visit my MGM Resorts’ Mlife Players Club post.