The Gidorah version is not a distinct card and is legally and mechanically Illuna, Apex of Wishes, as you can see by the sub-name included on the card
MtG Trading Card Game Return to Ravnica Common Cancel #31 Company: Wizards of the Coast Series: Return to Ravnica Brand: Magic The Gathering Item Type: Single Card Release Date: October 2012 UPC: Stock #: 246983 Our Guarantees to You, Our Valued Customer
In retrospect, it was resoundingly obvious: Blue Ugin was a rare combination of an iconic card and extreme scarcity, and players and collectors were willing to pay Tarmogoyf price for it
Instead, he chose to live amongst the beasties
(Ominous foreshadowing.) 3
Eisaku Inoue, an animation director at Toei Animation, noted that these kanji readings were not used in the anime series since they "might have cut down the laughs by about half"