Crypt Ghast Chief: One of the most exciting things about playing black is its potential to explode with huge burst of mana, which has made Crypt Ghast into a favorite for Commander players
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A 5/8 with islandwalk and swampwalk for six mana, Wrexial's evasion allows it to reliably deal combat damage each turn, especially within the Commander format in which one opponent is bound to control an island or a swamp
He's also great with RLS Legacy - Solar Galleon, giving him Evasive when you play him and then making it easier for you to get more characters onto the Legacy, making them all hard to deal with
Id say that Cave of the Frost Dragon is the next best fit by color, though its just a bit too inefficient to activate to really move the needle, and Hive of the Eye Tyrant is the next most powerful of the lot but that black aggressive decks just dont tend to have the best tools in most Cubes