Red decks may have trouble here, but Frigimon is no problem for a deck with ToyAgumon in it
While there are primarily near-mint (NM) sales that will capture your attention, you might find some small discounts if the condition doesn't bother you
The odds of action are better in Commander than in Modern at present, but this card is still commanding a high pre-order price of $20+
Its drawback is having to discard 2 energy after using the attack, but this wont be an issue if Crimson Storm is used to end the game
I dont think Standard will have too much to do with it, but we may start seeing it pop up in Izzet Pioneer decks soon
The most prevalent use of this card was as a way to win the game if time was called in Wyrm-type decks, as players would gain 400 LP for each Wyrm-type monster in both GYs, which would give them the necessary LP to win