In keeping with greens focus on creatures, many of these green lands synergize well with creatures, often rewarding you for either having many creatures or one large, powerful one
Other shadowless holos (Blastoise, Venusaur) in high grade run from the high hundreds into the low thousands of dollars, depending on grade
The rune deck (12 cards) is modeled independently from the main deck
Personally, Id choose a cheap commander like Rograkh, Son of Rohgahh or Yoshimaru, Ever Faithful to leverage that +1 ability to sacrifice for an extra card drawn
For every Angel of Despair theres a Putrefy, if you get what I mean
Pocket benefits from a market that understands season passes, daily engagement bonuses, and gacha-style collection loops