1 rushing river - only 1 piece of bounce... Chalice for 3 and you lose the game!
why would anyone play chalice for 3 against anything but uh....dragon with a chalice for 2 already on the table I guess....maybe old tog lists?
4 dark ritual - mandatory for most decks running black!!!
uh....manditory for most decks based on dark ritual you mean? last I checked CS, Dragon, Gifts, and stax all run black and don't run ritual....in fact the only decks to DO run ritual are fast combo decks which this is clearly not meant to be.
#3 A popular win cond for black is tendrills of agony...
and a popular wincondition for trix is donated illusions of grandure....tendrils decks use tendrils to kill....virtually nothing else does.
Overall discard is pretty risky as most opponents are trying to set up big graveyards so they can either weld in stuff or will stuff back or animate the dragon for the win.
if you're looking to play a 2/2 black beater I'd go with withering wretch as he can be used to negate the draw back of incidentally filling your opponent's yard, but overall I think this whole deck is just obsolete. If you're looking for a more updated list, though still probably slightly outdated but perhaps that can be worked on, Tog would be somewhat along the lines of your deck.
Hale