Infernal Fireworks will remove 1 Attack and 1 Armor point from all Infantry and Mounted cards currently on both fields during the War phase, before damage is assigned. The effect will carry over to subsequent rounds.
If you plan on garaunteeing this card, focus on non-infantry and non-cavalry.
Against this card, letting your infantry/cavalry get knocked out will restore them to full attack, but at the risk of being ruined.
This card can combo with Trenches to devastating effect.
Sacrificial outpost will absorb the damage, but not the debuff.