In the Arena league tournaments in Week 1 I ran a Maraxus Mono-Black deck around Bad Moon, Fallen Askari, Nether Shadow, Ashen Ghoul, and lots more
For example, you can sacrifice Tough Cookie (an Artifact Creature Food Golem) to activate Maraleaf Rider's ability (an ability with "Sacrifice a Food" in its cost)
The deck also plays a number of powerful and efficient removal spells including Anoint with Affliction and Crypt Rats, Card draw with Feed the Infection, and features a powerful Ninjutsu sub-theme with Nashi and Nezumi Prowler allowing your small, unblocked creatures to effectively generate tons of value
Tactical Teamwork features the Seven Dwarfs as a major thematic selling point, alongside item synergies that want players to think carefully and setup draws or banishes
These cards are so rare and hard to find that theyre effectively priceless
In fact, it only costs four mana normally, but you can actually cast it for free if you start the game with it in your opening hand