4 official rulings from Bandai. Straight answers to how this card actually resolves.
I digivolve a Digimon in my breeding area into a Digimon card with [Greymon]/[Garurumon]/[Omnimon]. Can I use this Tamer's effect to reduce the digivolution cost by 1?
No, digivolving Digimon in your breeding area doesn't trigger the effect that reduces digivolution cost by 1.
Does the second effect of this Tamer stack if there are multiple copies in play in my battle area?
Yes, each copy of this Tamer may be be suspended to reduce the digivolution cost by 1 each.
Can I play [ToyAgumon]/[Agumon Expert] with this card's <On Play> effect?
No, [ST5-04]/[ToyAgumon] is not named [Agumon]/[Gabumon]. The effect to play a Digimon does not have "in its name" in the card text.
This card's printing in BT-05: Booster Battle Of Omni has <Main Timing> as its effect and its RB-01: Reboot Booster Rising Wind printing uses <Your Turn>. Which version is correct?
This card is meant to have a <Your Turn> effect.
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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.