During damage calculation, if another Level/Rank/Link 2 monster you control battles an opponent's monster (Quick Effect): You can send this card from your hand or field to the GY
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Jeskai Flashback: Jeskai Flashback seems like it can be upgraded into a reasonable control deck, although it comes with a lot of risk: if your opponents play graveyard hate (and most experienced Commander players have learned that you should try to fit at least some into every deck), you could get locked out of the game altogether
As such, there is no specific dueling strategy built around them and their play style, although the majority focus on offensive tactics and destroying the opponent's cards, as well as pressuring the opponent by cornering them with various disruption and lockdown effects, banishing effects, or deck milling
If you believe your card is valuable, consider sending it to a professional grading service like PSA or Beckett to get an official grade, which can significantly impact the value