Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.)
You have a handful of cost-reducing effects in this deck that work as pseudo-ramp
With only 1,100 copies printed, Alpha rares like this are now among the most sought-after Magic the Gathering cards in existence
If you don't have a card in your hand, you can't pay this part of the cost and you can't activate the ability.
Now, there were a lot of problems with that that they tried a bunch of things to solve - in particular the third set was always lackluster ( Dragon's Maze or Avacyn Restored ), pushed to make it relevant, had a weird gimmick ( Alara Reborn being all multicolored cards) or a curve ball like Rise of the Eldrazi or New Phyrexia (completely upend everything that came before)
I think getting a Lander token may actually be better than that, so I can definitely see playing Beamsaw Prospector, especially in the sacrifice deck