Guerilla Hermit

When Guerilla Hermit enters the battlefield,
create four Powerstone tokens. (The tokens are artifacts with "{t}: Add {c}. This mana can't be spent
to cast a nonartifact spell.")
Powerstones you control are 2/ 2 green Squirrel creatures that are still artifacts.
At the beginning of your upkeep, pay {4} or
sacrifice Guerilla Hermit.