It not only protects your deck's leader with ward, it also attaches equipment for free and produces white mana to help pay for pricier artifacts
Its easier to get hold of
In fact, if you draw a copy of Grizzly Bears to start your turn, it is considered a creature card while in your hand, a creature spell while briefly on the stack, and then a creature permanent once its on the battlefield (and itll go back to creature card once it moves to your graveyard or exile zone
In decks where you really want specific creatures (usually an Emrakul) then this is just a good way to up the consistency of your deck
But with the return of Sagas and the introduction of the Omen cycle along with much more enchantment removal, even the lowly Mystic can get big enough to attack in the late game
This is far better than something like Blessed Light, even if the latter hits more permanent types