If you feel it is posing a challenge, we ask that you venture throughout Eorzea to collect more cards and then try to challenge these opponents again!
More cards barely help when the rng can give you an entire deck of 1* cards, and often does.

Seriously, go away and improve your deck before complaining waah it's too hard it's broken.
You clearly don't know what the random rule is. Your cards are chosen randomly from the cards in your collection. You're not guaranteed to get even a single 2* card. But the NPC almost always have the same deck packed with 3*, 4*, and 5* cards because their card collection is so small.

This guy knows what he's talking about, thank you.
Not if he thinks you can choose a deck to fight against a random opponent.