If you want a card for your deck, get it, but I have a hard time thinking that these will go up or down significantly
If your spellslinger deck needs to balance a wide board with a high instant and sorcery count, cards that make creatures when you cast instants and sorceries are king
Its really hard to get the card off ravenous though, since it requires paying at least 11 mana total for this creature
Of course, the base rarity of these cards undoubtedly contributes to their high prices, but it is still notable that the Japanese version is worth nearly triple the English version on the secondary market
But also look to fellow 1-mana spell Galvanic Discharge if the Modern energy deck works
As you can see, right now the hottest cards in the set are heavily slanted towards EDH