When it comes to getting booster packs, you have various opportunities to do so, but the main free-to-play option is checking in for your free booster every 12 hours
Abilities that trigger when one is destroyed won't be put onto the stack until Casualties of War has finished resolving
Our general is not a combo by itself, but the activated ability (while not the same as Flying Crane Technique) feels an awful lot like it if enough of your tokens are already flying, or when pumped by something like Shared Animosity or Cathars Crusade
Here's everything you need to know about Magic 's return to Middle-earth
These are the free sacrifice outlets in this deck: Altar of Dementia Carrion Feeder Cartel Aristocrat Spawning Pit Viscera Seer Priest of Forgotten Gods (must tap Priest of Forgotten Gods but should probably be done at sorcery speed unless you have an instant to use with the 2 extra black mana the ability will give you) While these are probably your best targets to sacrifice a creature, there are a couple more
You collect League Cards by playing the game, taking down trainers, and completing activities