4 official rulings from Bandai, last ruled Jan 24, 2025. Straight answers to how this card actually resolves.

There are two of these cards in the Battle Area. Can I activate the [Main] effect of these two cards to play a card whose name contains "Sistamon" or "Gankumon" with the total play cost I pay -4?
No, you cannot. No. [Main] More than one effect cannot be activated at the same time.
Ruled Jan 24, 2025
If I use this card's [Main] effect to play "BT20-057 Gancumon", does it activate the first effect of "BT20-057 Gancumon" and the total play cost I pay is -6?
Yes, the total play cost to be paid is -6.
Ruled Jan 24, 2025
Cannot minus the play cost you pay, such as "ST12-03 Solarmon." Can I activate the [Main] effect of this card to play a card whose name contains "Sistamon" or "Gankumon" when a Digimon with the effect is in the Battle Area?
It can be activated and played, but the play cost is not minus.
Ruled Jan 24, 2025
BT9-047 Pormmon" and so on, "Cannot play Digimon under the effect." Can I activate the [Main] effect of this card to play a card with "Sistamon" or "Gankumon" in its name when a Digimon with the effect is in the Battle Area?
It can be activated, but it cannot be played.
Ruled Jan 24, 2025
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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.