Honestly, this list is a little loose and I'll need to tighten it up a lot, but rather than talk about where this deck could be bad, let's talk about the cards I love and finally get to play in a cascade deck
Blood Pet Tinder Wall this is not, but Blood Pet does do a great job of being a delayed ritual of sorts in many mono-black decks
Better yet, since the backside triggers on the end step, you'll start generating value immediately, which gives it a leg up on some other battles that flip into creatures and need to survive a turn to do anything
Samurott is my favorite water attacker right now with 120 dmg and huge energy disruption that can slow down your opponent a ton
Like how Magic and Dungeons and Dragons became quite the pairing
You'll be flipping out when you see this deck popping off against creatures big and small