mtg vivien cards War of the Spark Rare Vivien, Champion of the Wilds #180 or a trample counter on it Vivien Champion of the Wilds

This allows you to take advantage of potent sacrifice outlets, as Gravecrawler can simply be cast again and again after its sacrificed

The second pair were green

On the other hand, this is the archetype where I have the least interest in mediocre battles since random mana/value creatures will struggle to flip them

This turns a board full of Pest and Bat tokens into a massive mana discount for your removal and finishers

This means your deck is naturally limited to what Avatar: The Last Airbender provides

I wouldnt play this tutor in every black deck, but Id certainly consider it if I had a bomb like Liliana, Dreadhorde General