Piston Sledge
Mana cost
Mana value3TypeArtifact — Equipment
Color identity
Colorless
RarityUncommon
SetMirrodin Besieged (MBS)
ArtistPete Venters
Price€0.16 · foil €0.55 · $0.13
Piston Sledge 
Artifact — Equipment
When this Equipment enters, attach it to target creature you control.
Equipped creature gets +3/+1.
Equip—Sacrifice an artifact.
Equipped creature gets +3/+1.
Equip—Sacrifice an artifact.
Only the goblins could make a simple machine so complex.
Legality
CommanderLegalStandardNot legalPioneerNot legalModernLegalLegacyLegalVintageLegalPauperNot legalBrawlNot legalOathbreakerLegalHistoricNot legalTimelessNot legalPenny DreadfulLegal
Rulings
2011-06-01
If there are no creatures on the battlefield that Piston Sledge could be attached to when its "enters" triggered ability resolves, it remains on the battlefield unattached.
2011-06-01
You can sacrifice Piston Sledge to pay its own equip cost. It won't become attached as it will be in your graveyard.