We make cards like this because it is flavorful and it's good for Limited for not all of black's creature-kill to be so efficient
So yes, when you replace an instance of card draw with dredging, youre milling cards, which counts for the purposes of Zellix, Sanity Flayer, for example
If you've never heard of this card before, that'll probably be because it was part of The Big Score: that strange collection of cards tacked onto Outlaws of Thunder Junction after Wizards of the Coast discovered what a disaster Epilogue Booster packs truly were, and excised them from all future MTG sets
Grim is cheap but he is not oppressive on tempo
It also combines quite well with a brand new Food card Eriettes Tempting Apple
Play lands to trigger landfall and create tokens Plants normally, Zombies once you've hit seven differently named lands