Rares
Rares are non-foil cards that are more difficult to obtain than common cards. The number of rare cards per set of cards varies by the series.
Ways to trade:
1 Rare for 1 Rare
1 Rare for 2-3 Commons
1 Rare for 2-3 Story
1 Rare for 1 Energy
1-2 Rares for 1 Foil
2-3 Rares for 1 Promo