Add Ashnod's Altar and you have a lot of mana
Now, those decks running 3 or 4 catch-all pieces of removal don't have any access to it
The options for mana dorks that are also Allies is extremely slim, too, which only makes this card more valuable to your deck
When we're doing the Secret Lair executions of this, it really does unlock the team to go wherever they want to go with it
Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)
Yavimaya, Cradle of Growth: A high value land, which helps mana fixing a lot by turning everything into forests