Kaheera, the Orphanguard

Companion —Each creature card in your
starting deck shares a creature type. (If this card
is your chosen companion, you may put it into your
hand from outside the game for {3} as a sorcery.)
As Kaheera, the Orphanguard enters the battlefield, choose a creature type.
Vigilance
Each other creature you control of the chosen
type gets +1/+1 and has vigilance.