Goblin Engineer
Creature — Goblin Artificer
Rarity
Rare
Mana Cost
Artist
Jehan Choo
Power / Toughness
1 / 2
Oracle Text
When this creature enters, you may search your library for an artifact card, put it into your graveyard, then shuffle., 
, Sacrifice an artifact: Return target artifact card with mana value 3 or less from your graveyard to the battlefield.
Rulings (2)
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Wizards of the CoastBecause targets are chosen for activated abilities before costs (such as "Sacrifice an artifact") are paid, Goblin Engineer's second ability can't target the artifact that will be sacrificed to pay its cost.
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Wizards of the CoastIf a card in a player's graveyard has
in its mana cost, X is considered to be 0.