So, how are you going to win off of this?
The rule of thumb: the faster your games end, the better rituals become
If you re-ban Golgari Grave-Troll, the deck simply slots in Golgari Thug, and while the deck is slightly weaker since it will dredge fewer cards on average, there's a good chance that, with the amount of support the archetype has, Dredge would still remain one of the best decks in the format
Another way you will be draining your opponents is by damaging them for 1 life for each creature that enters the battlefield
If you miss a triggered ability in casual play, players often allow a rewind
It's not even a creature, it's just face burn and if it ever gets blanked by something like a token or even incidental lifegain you are at a huge disadvantage