If I activate this card's [All Turns] effect when multiples of my [TS] trait Digimon would leave the battle area by my opponent's effects at the same time, are all of those Digimon prevented from leaving?
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Yes, all of those Digimon are prevented from leaving. This card's [All Turns] effect affects all Digimon without having to choose them.
Source: BT24-030 Neptunemon