Not a seed you'd expect from the Shard Of Alara of black,
Seed Code: Grixis
X: 238 / Y: 74 / Z: 238
Do you dare enter the cave of Grixis?
X: 252 / Y: 40 / Z: 240
The place to get your red mana from. Beware the lava! If you are experienced enough, mining west (-x) near the bottom of this place will reveal a lava cavern with gold. Screenshot is facing downward!
X: 292 / Y: 41 / Z: 272
A skeleton dungeon in the cave of Grixis truly complements the seed.