Cards like Seedborn Muse and Wilderness Reclamation are excellent if you have a lot of land, lands that produce more than 1 mana, or mana dorks so you can produce more mana, even on your opponents turn
The first gives Skithiryx haste, letting you attack the turn it comes out, and the second is to regenerate Skitheryx, which is a slightly outdated mechanic that keeps it safe through most actions
Many players bring their favorite decks in hopes of doing well rather than picking the best deck in the format
So you can use Yanmegas Pok-Power twice a turn by retreating it and use Sceptile to transfer all Energies to Yanmega for some big damage output
CHR / CSR: The predecessors to AR / SAR in previous series
Whenever you came to the game, whichever variant of a blue 1/1 that cant be blocked you prefer, they serve the same role: cheap bodies to exploit cards like Edric, Spymaster of Trest that reward you for dealing combat damage or a place to slap counters, equipment, auras, and whatever else you want to buff your army with