I also like this as a free sacrifice outlet in Commander decks that need one, since you can equip the Bloodghast and then unequip it to kill it, but a simpler way to do that is with the Hauberk which can sacrifice anything to give +4/+2 to a dork you control, like your Commander
Child of the Volcano costs four for a 3/3 trampling body
What it does do is flip easily to the back, which is what helped the card make the list
Its status as one of the lowest mana value cards on the list also means you can get it out early, putting up the barricade and setting up your engine before many players will be able to rival it
I'm a decent Magic player and I can build a pretty good Commander deck but I'm also well aware that I've got my own blind spots and deck-building foibles that affect how I play the game
I'll walk through some of them to demonstrate: Card Drawing: As I said above, blue is #1 and black is tied for #2