If you've run out of gems and would rather not spend more money in the game, paying entry fees with gold and accruing rewards in gems is the only way to rebuild your gem stash
Betters Trainer cards often have a price or a chance of failure, but they still make up a crucial part of any deck that is aiming for consistent success or multi-card combos and can make for a few interesting shake-ups midbattle
In the case of Legion Warboss Goblin token with haste and Heroic Reinforcements Soldiers with haste you end up with 4/4 flying, vigilance, haste Angels
The Cabbage Merchant gives you lots of complimentary cabbages, and I love that you don't need to sacrifice foods to turn them into mana
While not as fierce, Milotic has a similar appeal as Gyarados in the whole uggly-duckling-turned-attractive-Pokemon way
Buy four packs, grab two each, open them up, shuffle, and you are ready to play