The unwritten law of casino etiquette here is when your cards are dealt face-up, you never touch them. Alternatively, if your cards are dealt face down, then you can only touch your cards with one hand. Forget this rule or decide to touch them with two hands anyway and you can expect to be reprimanded instantly.
When visiting a casino its important to be respectful of others and follow proper etiquette. From dressing properly, being polite to all the dealer and other players. Know the rules of the games you're playing and your not using phone on the table. Always remember to have fun and be mindful to other players.