Angel's Herald
Creature — Human Cleric
, 
, Sacrifice a green creature, a white creature, and a blue creature: Search your library for a card named Empyrial Archangel, put it onto the battlefield, then shuffle.
Rigorous faith and belief are rewarded on occasion, and richly so.
Greg Staples
Rulings
You may sacrifice the Herald itself to help pay for the cost of its ability.
(wotc • 2008-10-01)
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.
(wotc • 2008-10-01)
To activate the ability, you must sacrifice three different creatures. You can’t sacrifice just one three-colored creature, for example.
(wotc • 2008-10-01)
Rulings
You may sacrifice the Herald itself to help pay for the cost of its ability.
(wotc • 2008-10-01)
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.
(wotc • 2008-10-01)
To activate the ability, you must sacrifice three different creatures. You can’t sacrifice just one three-colored creature, for example.
(wotc • 2008-10-01)