What makes it great is convoke, and its size, plus the indestructible
A white aura for two mana, while this aura provides an enchanted creature with the sought after indestructible ability, it comes along with a heinous downside
It does so even if Gorex dies
While costing six mana to transform isnt ideal, you will be able to cast a spell off of Hauken's Insight for free on the turn you do so
If you have a Water-themed deck with Max Potions and Capacious Buckets, you can heal your Blastoise VMAX to full health and then pull two guaranteed Water Energy from your deck
Layered onto all of this is a matter of timing: if you hit a red creature from either of these abilities, you still have to wait until the stack is empty to cast it