Maybe you can try Yu Gi Oh Duel Links, its really popular now, with more than 33 million downloads. Its a card game, comprises of attack, defense, magic and trap card. There are thousands of cards, lots of combined strategies so you might never get bored with it.

I work at offshore and my internet connected is really, really bad, sometimes just 2 or 3KB per second, but I still be able to play this game (a bit laggy though) so I don't think it will be an issue for you and your limited data