This card works well with many Pokmon, including Articuno EX, Lapras EX, Blastoise EX, Dragonite, and even Starmie EX to a lesser extent
With spells like Farseek and Rampant Growth fairly common and Simic Signet and Explore being common turn two plays, Growth Spiral looks even more attractive
It is also a late-game card
turning random cards into Treasure or rogues is useful long-term, plus Commander decks tend to have some extra mana around after ramping all game
One of the biggest things to come out of this development is the Game Changers list
TCGPlayer puts Goofy - Super Goof's value at $318, so although he's not quite at the very top of the value ranking, he's still up there with the best