With the game ending, I've been thinking about picking up everything I might ever want for the game before the stuff becomes impossible to find. My thinking is that it's going to become a game where I pre-make a deck for each faction, and then my opponent and I (or multiple opponents in pairs), can simply pick a deck and play. In order to do this, I obviously need extra cards, and at the moment I have an extra core (my fourth) on order, and I picked up a second copy of Legions of Death (mainly for Backlash and STC Fragment). While I own all the battle packs from all three cycles, I've only opened and played with cards from most of the Warlord Cycle so far, and this is at the root of my question for the fine folks here...
Assuming I'm going to make a deck for every faction, what battle packs (beyond my 1-of-each) would it make sense to pick up? Put another way, which packs would people say contain cards I'd want more than three-of to complete a deck for each faction?
To be clear, I'm not talking about tournament-caliber decks for every faction, but good, solid, fun, playable decks. Thanks in advance for any input!