The short answer is no. There is no way to cheat your way to more Gems or cards.
All pages that offer hacks, cheats, or free Gems/cards are either trying to install malware on your device or want to steal your personal information and/or account.
In order to reward the trust our users put in us, we are constantly monitoring our economy as we strongly believe that we need to provide our users with a safe environment to play in. All Players that attempt to cheat in any way will be spotted, punished, and removed from the game accordingly.
We believe that a friendly and cheat-free environment is essential to our games and to your enjoyment.