Inspired Idea

If an effect allows you to “cast a spell without paying its mana cost,” you can't cast that spell for its cleave cost.

If you cast a spell for its cleave cost, that spell doesn't have any of the text in square brackets while it's on the stack.

If multiple effects modify your hand size, apply them in timestamp order. For example, if you are affected by Null Profusion (an enchantment that sets a player's maximum hand size to two) and then resolve Inspired Idea without paying its cleave cost, your maximum hand size would be zero. However, if Null Profusion entered the battlefield after Inspired Idea resolved, your maximum hand size would be two.