Merger helps with consistency moreso, and the fact that it's optional for Normals is a big bonus
It also has quite a lot of mana in general with 39 plus five mana rocks accounting for nearly half the deck, and that's not counting mana-fetching spells like Sakura-Tribe Elder and Rampant Growth
This Enchantment Creature - Saga Ox card has nearly no synergy with the rest of the deck, and its expensive to play with its 6 mana value
Not only does the card art depict the 3D render of the legendary Pokemon surrounded by the standard holo effects, but the card borders also share this trait, giving it a more glamorous look
Before calculating the numbers, I assumed that the mythics would be lacking in value, mostly because the set is lacking the one really expensive mythic to help drive up the average value (while Gideon of the Trials is a chase mythic, at just over $21, it isn't the same as Liliana, the Last Hope, Chandra, Torch of Defiance, and the other uber-expensive case mythics we've seen in some recent sets)