3 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Which player gains 1 memory and <Draw 1> from this card’s <On Play> effect?
The player that activated this card's effect. This card's effect gives you 1 memory and <Draw 1> if the opponent player doesn't trash 1 Tamer card or Option card from their hand.
Ruled Mar 28, 2024
Does this card's <Opp Turn> effect activate when either my Digimon or my opponent's Digimon is played by an effect?
Yes, it activates.
Ruled Mar 28, 2024
Does this card's <Opp Turn> effect activate when a Digimon is played by a DigiXros?
No. DigiXros itself is not an effect, so the effect doesn't activate for a card played by a DigiXros as a main phase action. The effect will activate if a DigiXros is performed when a Digimon is played by an effect.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.