If this was just a creature with the Chapter I effect as an "enters" trigger, it'd be really good, and it's better in most ways -- since it can stun something else and then draw you at least one card before it goes away
Like the Revenant it also comes with a mana sink that enables you to deal damage, but its just better since you dont have to worry about the Ghast connecting with the opponent
It will feel pretty close to a bomb if you can do it consistently A two mana 2/2 with Haste is a solid starting point, and getting a +1/+1 counter or two on Ash is doable
Notably, because it's life loss instead of damage, and it doesn't target, it gets around some protection effects, like The One RingThe One Ring
You can get the most value from the discover mechanic by casting the card without paying its mana cost
The starter deck is packed with Items, Actions, and Songs that will help your deck achieve what it was designed to do