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The value of X is determined only once, as Summon: Yojimbo's fourth chapter ability resolves
However, her desire for revenge has not faded
In a fit of rage, Bolas abandoned his body to follow Tetsuo's spirit into the Meditation Plane, unaware that it was a trap
@GavinVerhey however, if forced to answer without context, my answer is "no" because attacking lets the opponent make the decision
In this case, the missing word is another, as in another target creature. Since I realized that Volrath, the Shapestealer is legally able to target himself, I delved into the potential implications of that omission and created a deck that can reset once-per-turn abilities for a massive profit