The Archon is a 3/2 with a highly useful protection ability
I consulted with Erik Lauer, the set's lead designer, and he felt that due to numerous factors, Zendikar Rising would be able to make individual landfall cards closer in power to original Zendikar block
If Grim Servant is still on the battlefield at that time, it will be included in that count
Fathomless descent Souls of the Lost's power is equal to the number of permanent cards in your graveyard and its toughness is equal to that number plus 1
While many MTG crossovers and Secret Lair products contain valuable reprints, that doesnt seem to have been the priority for this product, instead focusing on a range of cards that are still relevant to the Standard format
Because they count as lands and creatures, you can use board wipes like Flood of Tears and Ondu Inversion to remove everything except your animated lands, leaving you with the only board presence in the game