These are artificial aspects that dont make the games any more fun and are just there to force more grinding from the player and these games have enough grinding as is
Card Set(s) STARTER DECK -Green Roronoa Zoro- [ST-32] CARD VIEW ST32-004 | C | CHARACTER Silvers Rayleigh Attribute Slash Block Icon 5 Effect If your Leader has the attribute, this Character gains [Rush: Character]
Earthcraft is the best source of mana to fuel a number of infinite combos involving Doubling Season, Cathars Crusade, The Meathook Massacre, and Corpse Knight, among others, but these cards only scratch the surface of your combo potential with this commander, so if thats your preferred style of play, the linked primer above is going to be your best starting point for deck construction
While it has had a few reprints here and there, this version of the card is one of the harder versions to find
Collector's seem to think so, too