12 cards per pack.
As for the card, it's a copy of Akroma's Will, an instant that lets you choose between all your creatures gaining flying, vigilance, and double strike, or lifelink, indestructible, and protection from each color until the end of the turn
Something like Lyle Tiberius Rourke: Crystalized Mercenary, or Goofy: Extreme Athlete from Archazias Island would work well
Lathril, Blade of the Elves is a kindred Elf commander, generating 1/1 Elf Warrior tokens anytime she deals combat damage to a player
In a mono-color deck, it's impossible to be color screwed (assuming you're not playing an absurd amount of colorless lands for some reason), and in a two-color deck, it's pretty unlikely that you'll get color screwed with a properly built mana base featuring a reasonable number of dual lands and other types of ramp / fixing
Sephiroth, One-Winged Angel: Legendary Creature - Angel Nightmare Avatar Flying Super Nova - As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1
