Many older cards that still have a presence in Legacy, Commander, and Vintage may come with shroud attached - and it can be very useful to have if you know what to do with it
Also, its not legendary so it works well in multiples, since both the lifegain triggers and the +2/+2 bonus stack
And in Commander decks, there are just far more better options than these two cards, especially in the already competitive spaces of Isshin and Boros equipment decks
So both halves of Armadillo are very relevant post board against Phoenix
Hallowed Haunting offers similar value, and you wont even have to put mana into it
Three white creatures feels like a lot, but its a manaless way to remove a threat