"As peace should be—gentle yet unstoppable."
—Augustin IV

Azorius Herald

This creature can't be blocked.
When this creature enters, you gain 4 life.
When this creature enters, sacrifice it unless {U} was spent to cast it.

Azorius Herald is unblockable.
When Azorius Herald comes into play, you gain 4 life.
When Azorius Herald comes into play, sacrifice it unless {U} was spent to play it.

The List

RNA Guild Kit

Azorius Herald can't be blocked.
When Azorius Herald enters the battlefield, you gain 4 life.
When Azorius Herald enters the battlefield, sacrifice it unless {U} was spent to cast it.

Commander 2013

Azorius Herald can't be blocked.When Azorius Herald enters the battlefield, you gain 4 life.When Azorius Herald enters the battlefield, sacrifice it unless {U} was spent to cast it.