Don't pin your hopes on getting your room upgraded for free, until it actually happens.
With the platinum and certain other cards, your chances are probably higher, but even then its still quite a crapshoot.
If you happen to have some form of status or membership level with that hotel / casino, then your chances will be higher. More importantly, it depends on where and when you are going. If you are traveling to a busy/popular destination and/or during peak season, certainly don't expect any free upgrades just because you have the PRG.
JPMorgan Palladium (100k), AmEx Platinum (NPSL), AmEx SPG (46k), AmEx BCP (42k), Chase Sapphire Preferred (47k), Citi Prestige (31k), Citi Thank You Preferred (27k), Citi Executive AAdvantage (25k), JPMorgan Ritz-Carlton (21k), Merrill+ (15k), US Bank Cash+ (22.5k), Wells Fargo (12k), Bloomingdale’s (12.4k), Chase Freedom (5k), Discover IT (5k).