It was a great removal spell, could act like a huge Fireball to finish the opponent, a discard outlet and even a removal for your own Bloodghasts, so they can be returned with a land drop, so you could trigger Prized Amalgams
Some of the cards found in those decks can have a cost of 2, including Dalmatian Puppy - Tail Wagger, which lets you have up to 99 copies of itself in your deck
This is honestly a deck I might consider building in paper if nothing goes away at the end of the trial unban
A few crucial tech cards and stadiums will also be leaving the format, leaving fans to wonder what will replace them in the future
That's a huge price to pay, but totally worth it with what this Avatar Horror can do for you
If you can stay alive until your next turn when all the treasure tokens it creates untap, you will be in full control and should have no problems closing out the game