Up until now, MDFC lands were only mono-color lands and spells
Notably, the returned Rats don't need to be among the cards you milled, so if a powerful Rat gets removed, Ashcoat can easily get it back so long as you don't mind milling four cards (and that effect can play into graveyard synergies too)
It's an excellent jumping-on point for any newcomer to Commander, and a great addition to the collection for seasoned players.
The card represents a combination of two major franchises with Magic: The Gathering and Lord of the Rings
Given how slow the format is, players can spend an enormous amount of mana to sc scry for lots of cards -- enough to make the ability worth using in make X a huge number and scry enough cards for it to be highly efffective with a 100-card deck
How to Pre-order LotR: Tales of Middle-earth Fans can pre-order Tales of Middle-earth on Amazon or at a local tabletop games store, and expect to pay around $20 for the Starter Kit, $60 for a Commander deck and $60 for a Bundle