Causing an opponent to lose the game after you've announced that you're casting a spell with undaunted and determined its total cost won't cause you to have to pay more mana
If your answer is the ENG version because its cheaper, then get the JPN card (since its actually cheaper) If your answer is the JPN version, because value and desirability are tied, then get the JPN version, since you actually proved to yourself that the only reason you are considering the card in English is because the market decides its more expensive without any underlying fundamental
Still, despite getting crushed, he's easily one of my favorite commanders this year
Regardless, Devils Play has been better than existing other options like Demonfire, Banefire, and Red Suns Zenith
Whenever a foe searches their library, you draw and gain a life too