OK, so earlier today my wife had a Colossal Plow and a Peacewalker Colossus on the battlefield. In her hand was an Armed and Armored. She activated the ability of the Colossus to make the Plow a creature, then declared the Plow as an attacker and used the mana created by the Plow's attack trigger to cast Armed and Armored, making the Peacewalker a creature, and then attacking with the Peacewalker. Is that legal? It seems somehow to break the rule that all attackers are intended to be declared at the same time (or do I have that wrong?). Thanks in advance.
No, that's not allowed. Colossal Plow must have been a creature before it can attack, whether by its crew ability, by Peacewalker Colossus's first ability, or otherwise. Any abilities that trigger when a creature attacks (such as Colossal Plow's first ability) trigger only once the attackers have been declared, but in this scenario, Colossal Plow isn't a creature so it can't be declared as an attacker. See also this thread.
I suspect the answer is the same, but the scenario is 1) activate Peacewalker Colossus ability to make Colossal Plow a creature, 2) declare Plow as attacker, 3) cast Armed and Armored, to make Peacewalker a creature and 4) attack with Peacewalker. I see the problem as being that an instant was played after the declare attacker step was over, so it is too late to declare an additional attacker.
I suspect the answer is the same, but the scenario is 1) activate Peacewalker Colossus ability to make Colossal Plow a creature, 2) declare Plow as attacker, 3) cast Armed and Armored, to make Peacewalker a creature and 4) attack with Peacewalker. I see the problem as being that an instant was played after the declare attacker step was over, so it is too late to declare an additional attacker.
Indeed it's "too late to declare an additional attacker". Attacking creatures are declared at the beginning of the declare attackers step. It's only after attackers are declared that players get priority to cast spells (such as Armed and Armored) or activate abilities (such as Peacewalker Colossus's first ability), and by then it's too late to declare more attackers this combat. And this is so even though the declare attackers step hasn't ended yet.
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Attack trigger question