Junkyard Genius
From The Brothers' War set
Junkyard Genius
Creature — Human Artificer
2/2
When this creature enters, 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.