BLACK Archfiend of Despair Wound Reflection that denies lifegain like Erebos, God of the Dead on a 6/6 flying Demon
If left unchecked, Web of Life and Destiny can snowball fast digging five deep and putting a creature straight onto the battlefield each combat
Black has its very own gorgon, the Venomous Hierophant
Just like Jhoira earlier, I like him casting fat stuff for five mana, like Insurrection, Eldrazi Titans like Ulamog, Archangel's Light, Plague Wind, Searing Wind, the Ultimatum Cycle like Genesis Ultimatum, Conflux, Apex Devastator, Progenitus, Avacyn, Angel of Hope, the Ancient Dragon cycle, and loads more
This bracket is powerful with an eye toward a metagame and tournament structure