Brass Herald

As this creature enters, choose a creature type.
When this creature enters, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.
Creatures of the chosen type get +1/+1.

Commander Legends

As Brass Herald enters the battlefield, choose a creature type.
When Brass Herald enters the battlefield, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.
Creatures of the chosen type get +1/+1.

Eighth Edition

As Brass Herald comes into play, choose a creature type.
When Brass Herald comes into play, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.
Creatures of the chosen type get +1/+1.

Apocalypse

As Brass Herald comes into play, choose a creature type.
When Brass Herald comes into play, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library.
Creatures of the chosen type get +1/+1.

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to creatures of the chosen type may become lethal if Brass Herald leaves the battlefield during that turn.

The choice of creature type is made as Brass Herald enters the battlefield. Players can't take any actions between the time the choice is made and the time the appropriate creatures begin to get +1/+1.

You must choose an existing creature type, such as Human or Warrior. You could even choose Coward, if you dared. Card types such as artifact and supertypes such as legendary can't be chosen.