Puppet Conjurer
Artifact Creature — Human Wizard
, 
: Create a 0/1 blue Homunculus artifact creature token.
At the beginning of your upkeep, sacrifice a Homunculus.
He scowls at his imperfect creation, then crushes it to scrap. He salvages the etherium and begins anew.
Steven Belledin
Shards of Alara (ALA)
• #82Rulings
The Homunculus you sacrifice due to the second ability isn’t limited to being a Homunculus token put onto the battlefield by Puppet Conjurer.
(wotc • 2008-10-01)
If you control no Homunculi when the second ability resolves, nothing happens. There’s no penalty for failing to sacrifice a Homunculus.
(wotc • 2008-10-01)
The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.
(wotc • 2008-10-01)
Rulings
The Homunculus you sacrifice due to the second ability isn’t limited to being a Homunculus token put onto the battlefield by Puppet Conjurer.
(wotc • 2008-10-01)
If you control no Homunculi when the second ability resolves, nothing happens. There’s no penalty for failing to sacrifice a Homunculus.
(wotc • 2008-10-01)
The only difference between a colored artifact and a colorless artifact is, obviously, its color. Unlike most artifacts, a colored artifact requires colored mana to cast. Also unlike most artifacts, a colored artifact has a color in all zones. It will interact with cards that care about color. Other than that, a colored artifact behaves just like any other artifact. It will interact as normal with any card that cares about artifacts, such as Shatter or Arcbound Ravager.
(wotc • 2008-10-01)