Sphinx's Herald
Artifact Creature — Vedalken Wizard
, 
, Sacrifice a white creature, a blue creature, and a black creature: Search your library for a card named Sphinx Sovereign and put it onto the battlefield. Then shuffle your library.
He calls a riddle through the gaps of cloven clouds, hoping for an answer.
イラスト：
Shards of Alara#58アンコモン英語適正
裁定
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.
To activate the ability, you must sacrifice three different creatures. You can’t sacrifice just one three-colored creature, for example.
You may sacrifice multicolored creatures as part of the cost of the search ability. If you sacrifice a multicolored creature this way, specify which part of the cost that creature is satisfying.
You may sacrifice the Herald itself to help pay for the cost of its ability.