And for seven mana, you can exile any permanent to then transform her into the Mothercrystal, doling out counters and making one of your creatures indestructible (a great way to protect your Destined Warrior)
Most of the time you can resolve your spells and Prowess triggers in such a way to target your own creature and have it survive, but no need to take that chance if you dont have to
An indestructible 6/7 enchantment creature that costs three generic, one green, and one white, she rewards casting creature spells with letting you tutor for a forest or plains land
Bloom Tender, Hexing Squelcher, Formidable Speaker, and Moonshadow are some of the other choice cards, but a lot of whats going on here is typal, so its specific to the archetype youre building