And if you cant find enough Nightmares to staff your grisly mill, Umbris also works just as well with Horrors, giving you more options during deckbuilding
For an aggressive deck, mono-green has a lot of staying power: Icetill Explorer lets us play more lands, Sapling Nursery creates 3/4 tokens, and Earthbenders Ascension keeps adding more +1/+1 counters on creatures
I also remember having movie cards when I was a kid and The Phantom Menace had just been released
Figuring out exactly what mix of three mana cards you should play will be a bit tough, but once the deck is ironed out and a good sideboard is made, this deck should hopefully be able to battle it out against all sides of the format, from White Weenie to Alrund's Epiphany with access to the best that Black and Blue have to offer
Throwing this sword on a Blightsteel Colossus can be a lot of fun