When Junkyard Genius enters the battlefield, create a tapped
Powerstone token
(A Powerstone is 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 (This creature can't be blocked except by two or more creatures.) and
haste (This creature can attack, and as soon as it comes under your control.).