Quicksmith Rebel
Oracle Text
When Quicksmith Rebel enters the battlefield, target artifact you control gains "
: This artifact deals 2 damage to any target" for as long as you control Quicksmith Rebel.Card Rulings
2/9/2017 If Quicksmith Rebel leaves the battlefield, you no longer control it.
2/9/2017 If another player gains control of Quicksmith Rebel, the artifact will no longer have the damage-dealing ability, even if you regain control of Quicksmith Rebel.
2/9/2017 If Quicksmith Rebel leaves the battlefield while its ability is on the stack, the artifact never gains the damage-dealing ability.
2/9/2017 If Quicksmith Rebel or the artifact leaves the battlefield while the damage-dealing ability is on the stack, that ability resolves as normal.
I kid. If you throw this down and instantly shock something with a puzzleknot, you get okay value (mini-flametongue kavu isn't terrible). If you reuse the ability (requiring it and your artifact to life for a round) at least once, you gain pretty good value.
Or with Panharmonicon.