As collectors items, all the games have cards that are worth at least quintuple digits, whether for sentimental reasons, gameplay reasons, or rarity
The rules distinguish between abilities that happen to generate mana and true mana abilities, which receive special treatment under the game rules
After the team made the Shrine cycle, they realized there was an opportunity to do something a little more
Pull it out of the garbage and dust it off with Daretti, Scrap Savant or Goblin Welder
Given this deck's love of lands both in the graveyard and in play, it seems like a powerful consideration
#3 They could've made like five new, exclusive cards and one could be that Gengar haunting pikachu (with different ability and attack)