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

Can I suspend this Tamer when my opponent plays a Lv.- Digimon?
Yes, you can. However, Lv.- Digimon don't have a level, so the "gain 1 memory if that Digimon is level 4 or higher, and <Draw 1> if it is level 3" effect doesn't activate.
Ruled Mar 28, 2024
What happens if I suspend this Tamer when my opponent plays both a level 3 and a level 4 or higher Digimon at the same time?
Both of the conditions are fulfilled, so you gain both 1 memory and <Draw 1>.
Ruled Mar 28, 2024
If I suspend this Tamer when my opponent plays 2 level 3 or level 4 or higher Digimon at the same time, do I gain <Draw 1> or 1 memory twice?
No, you don't. You only <Draw 1> once even if multiple level 3 Digimon are played, and you similarly only gain 1 memory even if multiple level 4 or higher Digimon are played.
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.