A surface level, the rarities determine how likely you are to find a card overall
Marcy: I can't think of any way to sum up Prompto's personality that this card isn't already doing
At this point you can invest in cards like Ashe, Princess of Dalmasca, Combat Tutorial and Adventurers Airship to help keep your hand fueled, and even more cheap interaction like Youre Not Alone, Ice Magic and Syncopate to force through the win
That being said, the Amber and Emerald deck isnt bad per se
The TCG has been growing steadily since its initial release and following the meta-shifting introductions of Rise of the Floodborn and Into the Inklands, theres a healthy variety of competitive deck options
With ruby excelling in cards built around aggressive challenges, it can even the odds in an outmatched fight against a bigger opponent - or simply make a stocky character even more of a threat