When Junkyard Genius enters the battlefield, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
, Sacrifice another creature or artifact: Until end of turn, other creatures you control get +1/+0 and gain menace and haste.
Locations
: Add 
. This mana can't be spent to cast a nonartifact spell.")
