Can I use this card's ＜Main Timing＞ effect to give "＜Start Your Main＞ This Digimon attacks" to a Digimon that isn't affected by effects?

You can give that effect to such Digimon, but Digimon that aren't affected by effects won't be affected by it, therefore the gained effect won't trigger.

Fist of Athena rulings (BT18-099)

1 official ruling from Bandai, last ruled Jan 10, 2025. Straight answers to how this card actually resolves.

Effect: While you have a Digimon with [Knightmon] in its text, you can ignore this card's color requirements. [Main] Until the end of opponent's turn, 1 of your their Digimon gains "[Start of Your Main Phase] This Digimon attacks." Then, place this card in the battle area. [All Turns] When attack target changes, Delay ・1 of your Digimon gains Piercing and Security A. +1 until the end of your turn.
Security effect: [Security] You may play 1 level 5 or lower Digimon card with [Knightmon] in its text from your trash without paying the cost. Then, place this card in the battle area.

Official Q&A

Can I use this card's ＜Main Timing＞ effect to give "＜Start Your Main＞ This Digimon attacks" to a Digimon that isn't affected by effects?
You can give that effect to such Digimon, but Digimon that aren't affected by effects won't be affected by it, therefore the gained effect won't trigger.
Ruled Jan 10, 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.

Fist of Athena rulings (BT18-099)

1 official ruling from Bandai, last ruled Jan 10, 2025. Straight answers to how this card actually resolves.

Effect: While you have a Digimon with [Knightmon] in its text, you can ignore this card's color requirements. [Main] Until the end of opponent's turn, 1 of your their Digimon gains "[Start of Your Main Phase] This Digimon attacks." Then, place this card in the battle area. [All Turns] When attack target changes, Delay ・1 of your Digimon gains Piercing and Security A. +1 until the end of your turn.
Security effect: [Security] You may play 1 level 5 or lower Digimon card with [Knightmon] in its text from your trash without paying the cost. Then, place this card in the battle area.

Official Q&A

Can I use this card's ＜Main Timing＞ effect to give "＜Start Your Main＞ This Digimon attacks" to a Digimon that isn't affected by effects?
You can give that effect to such Digimon, but Digimon that aren't affected by effects won't be affected by it, therefore the gained effect won't trigger.
Ruled Jan 10, 2025

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