I've been having a really hard time with this. Here's some stuff that hasn't worked:
1. Putting "attack 2", "attack,2", "attack - 2", etc. in Art - Animation Names. Apparently the object editor can't use a specific of a random animation like "attack".
2. Trigger, where Unit Starts the Effect of an ability, Animation - Play (triggering unit)'s attack,2 animation. Every animation was cancelled out by the animation of Acid Bomb.
3. Doing #2, but leaving the Art - Animation Names blank in Acid Bomb. Just defaulted to the unit's spell animation.
4. Modifying #2 with Finishes Casting an Ability, Starts Casting an Ability, and Reset Unit Animation.
5. Modifying #2 with Play unit animation (specify rarity), using attack and "only Rare animations".
Summary: It seems you can't set Attack - 2 in the object editor, and whatever you do with triggers is canceled out by what's in the object editor, even if the object editor's field is blank.
1. Putting "attack 2", "attack,2", "attack - 2", etc. in Art - Animation Names. Apparently the object editor can't use a specific of a random animation like "attack".
2. Trigger, where Unit Starts the Effect of an ability, Animation - Play (triggering unit)'s attack,2 animation. Every animation was cancelled out by the animation of Acid Bomb.
3. Doing #2, but leaving the Art - Animation Names blank in Acid Bomb. Just defaulted to the unit's spell animation.
4. Modifying #2 with Finishes Casting an Ability, Starts Casting an Ability, and Reset Unit Animation.
5. Modifying #2 with Play unit animation (specify rarity), using attack and "only Rare animations".
Summary: It seems you can't set Attack - 2 in the object editor, and whatever you do with triggers is canceled out by what's in the object editor, even if the object editor's field is blank.