Instant cards that change Attack or Defense: apply only to the current attack.
Ongoing and Activation cards: declared before the attack, last as printed on
Combat FAQ: Card Effect Duration in Combat
Instant cards that change Attack or Defense: apply only to the current attack.
Ongoing and Activation cards: declared before the attack, last as printed on the card.
An effect lasts longer than one attack or round only if the card text says so.
Instant cards that modify Attack or Defense apply to the current attack being resolved. Ongoing and Activation cards are declared before the attack and last as printed on the card. If a card's effect lasts longer than one attack or one round, the card text says so explicitly.
H3 Master is a free, unofficial companion app for Heroes of Might & Magic III: The Board Game by Archon Studio. It has the full rulebook with a Q&A, all 61 scenarios from the 10 mission books, every unit, hero, spell and artifact card, a game setup wizard and an AI Game Master that answers rule questions with citations. English and Russian, no account, works offline as a PWA.