Having the relevant basic land type attached to them elevates their power compared to many other dual lands, however, the drawback of entering the battlefield tapped levels the playing field
It asks you to play control, but also gives you cards for your troubles solving one of the issue with control in non-blue decks in Commander
Enchanted creature has menace and "Whenever this creature deals combat damage to a player, create a Treasure token." (It can't be blocked except by two or more creatures
If the rare case where you control two of The Earth Crystal, the number of +1/+1 counters put on a creature is four times the original number
The original Khans of Tarkir (due to a lot of work by Erik Lauer) is considered the first time R&D really handled three-color design well
Alongside these powerful legends, Maralen, Fae Ascendant has also been proving popular thanks to supporting a forgotten archetype