Blackwing - Kalut the Moon Shadow

Edison Card Text
① During the Damage Step, if a "Blackwing" monster you control battles (Quick effect):
You can send this card from your hand to the GY; until the End Phase, that monster gains 1400 ATK.
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
If Shrink is CL1 and Honest/Kalut is CL2, how is ATK calculated?✓
ATK modifiers resolve in chain during Damage Step.
Honest/Kalut resolves first, then Shrink halves the monster's original ATK. After that, other ATK modifiers are applied, yielding the final total.
How do Honest vs. Honest or Honest vs. Kalut resolve in Damage Calculation?✓
Both players want to use Honest (or one uses Kalut).
The turn player has the priority to activate their Honest/Kalut first in Damage Calculation. If both are activated, resolve the chain in order: the last effect to activate applies first, then earlier effects apply on top of that. An Honest that resolves will set the involved monster's ATK to the opponent's current ATK, so a later-resolving Honest (earlier Chain Link) effectively overwrites earlier boosts; when Kalut is involved, resolve each link in order and apply the 1400 boost before resolving the next link to see the final ATK.
Rulings
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● This effect can be activated at any time in the Damage Step, even During Damage Calculation.
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When a "Blackwing" monster you control attacks or is attacked, you can send this card from your hand to the Graveyard during the Damage Step to have that monster gain 1400 ATK until the End Phase.
Sending “Blackwing – Kalut the Moon Shadow” to the graveyard is a cost to activate its effect.
The effect of “Blackwing – Kalut the Moon Shadow” does not target.
You can send “Blackwing – Kalut the Moon Shadow” to the Graveyard during either player’s turn, as it is a Quick Effect.
This effect CAN be activated in Substep 4 - Damage Calculation of the Damage Step.