You get all those cards that care about Forests or Swamps, and a colorless option to cycle the land away
The only way for the Nighthawk to kill the Skyfisher is if Sara blocks Nicks Nighthawk with it, or if Sara attacks with the Skyfisher and Nick blocks with the Nighthawk
Historically, these cards have only gone up in value as the limited supply dwindles down
For newcomers, the Avatar Beginner Box offers great value for only $31 (was $35)
(Some of them would take up more room than we have in the text box by themselves, but you probably won't control that many lands.) In case you do end up with more than 31 lands, the remaining prime numbers below 100 are 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97