It generates sacrifice fodder, gives you a sacrifice outlet, and incidentally hates on your opponents' graveyards
Your Commander absolutely affects your mana curve since you can rely on that card being available
Goblin Banneret has really impressed me as a card, but its best with other mentors so that you can get a counter on it, and then it can start putting counters on other things without requiring a mana investment
Greens plan was to attack with a big creature, force some damage with trample, and maybe use a combat trick like Giant Growth
In Pokmon Trading Card Game Pocket, opening either the Genetic Apex Mewtwo, Pikachu, or Charizard booster packs freely will likely set you back on your way to building a full collection and a competitive deck as each one offers different cards and different early-game rewards