Hes a powerful engine in the command zone, especially in conjunction with Curiosity effects
This isnt to say you cant get some repeatable triggers throughout the game, but a lot of these tend to be tied into the other evergreen white-black strategy, aristocrats
This sliver turns your army of cheap slivers into unassailable behemoths
Thats an outrageous bit of value attached to one of your characters and it also protects you against the classic one-two punch of the meta defining ruby-amethyst control deck of set two, which would wipe your board with Be Prepared and then answer the first character you play with a Lady Tremaine which would force you to sacrifice it
The front half is a very solid removal spell, while the back half can end the game on the spot if it goes long enough
Flavorful Design Final Fantasy is known for overlapping certain characters and Summons, such as Bahamut, but these characters will only be represented as one mechanically unique card (with one hilarious exception), and was chosen based on their relevance to their respective games story