They provide powerful effects for free every turn, and can often totally cripple your opposition, ample as it is
Kogla and Yidaro can enter the battlefield with haste, or fight something, or be cycled to destroy an artifact or enchantment
Also, well have foil versions of the new-to- Magic cards in the Starter Kit
If Deathless Knight enters your graveyard after you've gained life in a turn, its last ability can't trigger during that turn
Because Rattleclaw Mystic gets copiable values of Sagu Mauler which are then changed by its face-down status since copying doesnt change a permanents status
Later in the game, Shalai provides a great way to dump your mana into her second ability to start adding tons of +1/+1 counters to your board