Effect
FLIP: Target 1 monster your opponent controls; destroy it.
The effect of "①" is a Trigger Effect that activates on the field. (This effect targets 1 monster in your opponent's Monster Zone.)
This is a mandatory effect that activates when "Summoner of the Genbu" itself is flipped face-up. (It also activates during the Damage Step. It activates even if there are no monsters in your opponent's Monster Zone, but since there is no target to select, the effect is not applied.)
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