Having played against some goad decks in my play groups ( mostly Kardur, Doomscourge), they can have trouble closing out games
At 6/6 for six mana, he offers a solid body that can immediately start generating value through his attack trigger
it can get purring by turn three or so and keep the pressure on with its mix of individually powerful cards and delightful synergies
This translates well into both casual and competitive tables, as there isnt much functional difference between preventing your alpha strike from being blown out by a fog or protecting your combo turn from counterspells or removal
The rarity of the event promo adds a little extra sparkle, too
There are fan-favorite legendary Pokmon, like Mewtwo VSTAR [Pokmon GO], that will find a home in powerful decks