A great card can be worth a decent amount even if it's printed at common rarity, while a super rare one that nobody wants to play could be worth significantly less
As one of black manas most populous archetypes, Zombies enjoy a wealth of support in most MTG sets, particularly ones with a focus on horror like Innistrad and the upcoming Duskmourn
This can make it great to assist in delirium when milled but useless when it never sees the graveyard
(You also lose 5 life, though.) Be careful about the relationship with the additional 2 mana cost incurred based on the number of times you have cast your commander
For long-time fans of the game, this is a bigger deal than it sounds
Adventure Lands Ishgard, the Holy See Jidoor, Aristocratic Capital Lindblum, Industrial Regency Midgar, City of Mako Zanarkand, Ancient Metropolis The adventure lands are far more exciting than the towns