In the Smash Up game, Ninjas have a poison action card. Will it have any effect on Warbot, who is a minion which cannot be destroyed?
Will it have any effect. Yes. The effect will be to reduce the power to 0. However poison doesn't destoy the minion merely reduces it's power. To the Warbot will be a minon of 0 power. While most of the time this is an academic point there are cards that are affected by minion prescence. For instance
Count how many minions you have on a base. Destroy a minion with that power less than or equal to that number.
In this instance, the Warbot though it does not give any power, would still count as a minion. Plus the poison action can be removed restoring the Warbot to full power or the Warbot can have other actions placed on it that increase it's power to again.