Each one is a colorless artifact with the artifact subtype Lander and the ability ", , Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle." Some spells and abilities that create Lander tokens require targets
It doesn't matter if those spells resolved, didn't resolve, were countered, or are still on the stack
While you might be throwing out an All Is Dust or Austere Command from it once in a while, you're more likely to be playing smaller cards like an un-overloaded Vandalblast
Land Color tag templates(None) Sunpetal Grove This land enters tapped unless you control a Forest or a Plains
This lil' combo is not only annoying, as it is a snooze fest, and unfortunately, it is still too trusty for the Niv Mizzet, Parun deck to have at least one of the pieces which make this possible