Grim Flayer, Glowspore Shaman, and Meren of Clan Nel Toth all work towards either filling up the graveyard or using the graveyard as a resource, as well as playing nicely with a lot of the fun buildarounds in that color pair like Birthing Pod and Recurring Nightmare
There was also the clarification that even though all cards with madness are discarded into exile, it would go into the graveyard and still be considered discarded from your hand if you didnt choose to play it
Clearing a creature from our opponents board while getting more Elves is a powerful effect from a land
Also note that if you wanted to build a Mono-Red Devil deck you could do so although it's not needed
Most folks even consider these fetch lands to be better than the reserve list True Dual lands
Add to your card pool with black cards, first released in ST-05, and yellow cards, first released in ST-07