In essence, every MDFC is a slightly overcosted spell combined with a slightly underpowered land (thanks to coming into play tapped or costing three life to come into play untapped, in the case of the mythic MDFC cycle, and only tapping for one color of mana)
The Battle of Sargasso allows Yuma to achieve his Zexal II form, allowing him to use his Shining Evolution skill to convert existing cards into new ones
If the card is guaranteed Rare: 7.5% chance it becomes a Super Rare
It has the grossest, scariest creatures, the most efficient removal, and the highest likelihood to tilt an entire table
It fits right into the Prossh, Skyraider of Kher precon it came in and has out-valued many of the new-to-Magic cards from that set
The Ancient Pokmon Gouging Fire ex and Raging Bolt ex show their primordial prowess, while the Future Pokmon Iron Boulder ex and Iron Crown ex demonstrate metallic mastery