While this seems defensive, on attackers like Scream Tail or Drifloon (whose damage is based on how many damage counters are on them), more HP means you can place more damage counters on them, resulting in a more powerful attack
Bastion Protector, Bloodsworn Steward, and Guardian Augmenter give +2/+2 and a keyword to your commander creatures
I'll briefly go into each deck, and show off an interesting card that's hidden in their 99s: First Flight: Helmed by Isperia, Supreme JudgeIsperia, Supreme Judge, this deck is filled with flyers, and value pieces that support your air forces
Base Set Trainer Cards : Positioned as valuable for their gameplay and historical importance
Pay the eternalize cost, exile the card from your graveyard, and be richly rewarded with a 4/4 copy of that card, except it's a black Zombie in addition to its other types and it has no mana cost (and thus has mana value 0)
In fact, Final Fantasy 7s Limit Break is STILL $72.50 at Amazon