If Player A controls both battlefields with an 8 Might unit at one and a 3 Might unit at another, and Player B plays Gust, can Player A use Mystic Reversal to avoid bouncing their own unit? If not, what is the correct judge ruling for a rewind request in high OPL?

Ruling: When Player A uses Mystic Reversal on Player B's Gust, they gain control of the spell but must still choose a valid target. Since the only valid target is Player A's own 3 Might unit, Mystic Reversal becomes a waste and the 3 Might unit still gets bounced. At high OPL, this is a misplay and does not warrant a judge-initiated rewind.

Sequence:

• Player B plays Gust
• Player A reacts with Mystic Reversal, taking control of Gust
• Player A must make new choices but cannot choose "no target" to fizzle the spell
• Player A must target their own 3 Might unit (the only valid target)
• The 3 Might unit is bounced

Nuances:

• You cannot choose "no target" when taking control of a spell with Mystic Reversal if valid targets exist - the same targeting rules apply as if playing from hand
• At low OPL, a rewind might be appropriate since there's no information gain
• If both players agree to a rewind, they will likely do so regardless of official ruling once the judge leaves