Sword of Feast and Famine is the best of the bunch protection from two relevant colors, a discard trigger, and untapping all your lands on combat damage
Unlike the cards from the Starter Kit, these four promos have the signature star-shaped promo stamp in the set symbol area, which technically makes them unique printings of the card
It also reintroduced Trainer-classified cards (Trainer, Supporter, Stadium)
Questing Beast Im not sure this is where you want to be in mono-green, but Questing Beast has the neat trick of being able to use Fog effects as combat tricks
You're not just running Zodiark for the board impact - you're running it as a value engine in Mazirek, Kraul Death Priest, Yahenni, Undying Partisan, or Mikaeus, the Unhallowed builds
Interestingly, demand for Marneus Calgar hasnt been constant, but it seems a buyout is the cause of this price spike