What happens for this card’s ＜When Attacking＞ effect if my opponent doesn't have any level 4 or lower Digimon cards in their trash?

Because nothing can be played from their trash, you can't switch the target of this card's attack, and the attack will continue using the target that was specified upon the attack declaration.

WaruSeadramon rulings (BT15-078)

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

Effect: [All Turns] [Once Per Turn] When an effect plays an opponent's Digimon, until the end of their turn, all of their Digimon gain "[On Deletion] Lose 1 memory."[When Attacking] Your opponent plays 1 level 4 or lower Digimon card from their trash suspended without paying the cost. [On Play] effects on Digimon played by this effect don't activate. Then, you may switch the target of attack to that Digimon.
Inherited effect: Piercing

Official Q&A

What happens for this card’s ＜When Attacking＞ effect if my opponent doesn't have any level 4 or lower Digimon cards in their trash?
Because nothing can be played from their trash, you can't switch the target of this card's attack, and the attack will continue using the target that was specified upon the attack declaration.
Ruled Mar 28, 2024
When an effect plays an opponent's Digimon into the breeding area, does this card's ＜All Turns＞ effect activate?
No, it doesn’t activate.
Ruled Mar 28, 2024
Does this card's ＜All Turns＞ effect also activate when one of my effects plays an opponent's Digimon?
Yes, it activates.
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.

WaruSeadramon rulings (BT15-078)

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

Effect: [All Turns] [Once Per Turn] When an effect plays an opponent's Digimon, until the end of their turn, all of their Digimon gain "[On Deletion] Lose 1 memory."[When Attacking] Your opponent plays 1 level 4 or lower Digimon card from their trash suspended without paying the cost. [On Play] effects on Digimon played by this effect don't activate. Then, you may switch the target of attack to that Digimon.
Inherited effect: Piercing

Official Q&A

What happens for this card’s ＜When Attacking＞ effect if my opponent doesn't have any level 4 or lower Digimon cards in their trash?
Because nothing can be played from their trash, you can't switch the target of this card's attack, and the attack will continue using the target that was specified upon the attack declaration.
Ruled Mar 28, 2024
When an effect plays an opponent's Digimon into the breeding area, does this card's ＜All Turns＞ effect activate?
No, it doesn’t activate.
Ruled Mar 28, 2024
Does this card's ＜All Turns＞ effect also activate when one of my effects plays an opponent's Digimon?
Yes, it activates.
Ruled Mar 28, 2024

Got a line that uses WaruSeadramon? Map it in the builder and share it with a link.