It's truly a staple in the sense that decks playing a lot of black cards will want to run Coffers because the upside is huge and the cost is next to nothing, especially when paired with Urborg, Tomb of Yawgmoth, leaving nothing up to chance in terms of how many Swamps you'll have in play
Gaining wisdom is blue, discarding to draw is red, and seeking power at any cost with The One Ring is black, making Sauron, the Dark Lord a true Grixis supervillain
Now Elder Spawn here is a actually a very bad card since it's one that demands you sacrifice one of your land cards every turn, but it is admittedly rather flavourful
Legendary Creature - Human Shaman Sepulchral Primordial Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.) When this creature enters, for each opponent, you may put up to one target creature card from that player's graveyard onto the battlefield under your control