Toxic Deluge Toxic Deluge is the best black boardwipe, and its not even close
Alternatively you can deceive your opponent in a different way by punishing any easy blocks with combat tricks like You Are Already Dead
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Since you won't always have a good target, you might as well draw a card and keep your momentum going since green usually has plenty of extra mana to go around
Have The Thirteenth Doctor as the secondary commander for more synergy
If you really want to stick it to that one Lier, Disciple of the Drowned player, there are a handful of cards that prevent your opponents from taking extra turns: Of these effects, Gerrard's Hourglass Pendant and Trouble in Pairs stand out as desirable effects for the average EDH deck