1 official ruling from Bandai, last ruled Nov 1, 2024. Straight answers to how this card actually resolves.

If I activate this card's <All Turns> effect when multiples of my other Digimon with [Knightmon] in their text would leave the battle area by my opponent's effects at the same time, and I place this Digimon as 1 of those Digimon's bottom digivolution card, are all of my other Digimon with [Knightmon] in their text prevented from leaving the battle area?
No, only the Digimon where this card was placed as the bottom digivolution card is prevented from leaving the battle area.
Ruled Nov 1, 2024
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