You need to be able to support a colorless Land, and if getting to isn't likely, it won't work, but Westvale Abbey is solid in many decks as a mana sink, and Ormendahl is a problematic threat no matter the situation
Valakut decks are fully capable of winning on turn four, either through Scapeshift or Primeval Titan
Legendary Land Color tag templates(None) Mountain Basic Land - Mountain Color tag templates(None) Path of Ancestry This land enters tapped
Once these sheets make their way through the print process and get cut, we get cards that have layers that are either partially or fully separated from one another
Not to mention, a full graveyard just gives you additional information to play with outside of the cards in your hand
Let's see what the rough ratios are for Merciless Rage and how it compares: 40 lands and Solemn Simulacrum, K'rrik, Son of Yawgmoth, Sol Ring, Rakdos Locket, Hedron Archive, wow really that's it