A 4-mana 2/5 that can crank out 2/2s is a nice mana sink, and it actually combos pretty well with itself, since you can just choose to use that ability rather than cast spells, and that allows you to still add to the board while getting to transform the Child into its werewolf form, which will be making that same token into a 3/2 -- and pumping your whole board in generally is pretty nice
How do I stop my Auras from getting destroyed
That's what your white indestructible tricks like Rootborn Defenses already cost, and you are adding an untap, so you can untap your team to block out of nowhere
In control decks it offers the necessary protection and time to develop, and in aggro decks it clears the way for creatures to attack
Whenever you use one of the new bending mechanics like water, earth, fire, or air, you get to draw a card, which is one of the best things you can do in Commander
Usually, a board wipe is game over, but Mantle of the Ancients brings every piece of Equipment and Aura back from the grave in one go