These monsters benefit from having more monsters in the Graveyard to be banished. Dark Necrofear can easily be summoned if you have milled out at least 3 DARK Fiend monsters. Tyranno Infinity gains massive ATK boost if you have milled out a lot of Dinosaur-type monsters and banish them from your Graveyard. Gaia Plate the Earth Giant can easily be Special Summoned and maintained with a substantial amount of Rock monsters being milled out. Prometheus, King of the Shadows can proceed to banish any number of DARK monsters from your Graveyard to greatly enhance its ATK until your end phase. Chaos Necromancer ATK greatly increases with the number of monsters in your Graveyard.
This card is obviously extremely powerfull if anything speed duels buff the grass as 30 card decks can open it much more consistently than their 60 card counterpart my guess is that if the meta shifts more towards graveyard effects konami will have to ban it or release a skill which plays necrovalley at the start of the duel
Flobbles 31days ago
This should by all rights work with my Sylvan deck, but they don't trigger their effects from the excavation.