You must have a Lesson card in your graveyard while you attack with Fire Nation Cadets in order for the firebending 2 ability to trigger
Niv-Mizzet, Supreme gives every 2-color instant and sorcery jump-start, so you can recast cards like Wear // Tear or Drown in the Loch just by discarding another card
You've got the Pack Hourglasses that we've also mentioned, but there's also Wonder Hourglasses, which let you reduce the time it takes to recover Wonder Stamina and dive into more Wonder Picks
Lists are subjective, so be sure to leave a comment if you disagree with any of my picks
The most valuable Dragonite cards typically include 1st Edition holographic cards from early sets, Gold Star variants, Alt Art cards from modern sets, and promotional cards with limited distribution
Doesn't include instructions on how to play the game