It doesn't come cheaply!

In obedience to his calling, the intercessor embodies a costly solidarity with the people who are often hostile to him. Thus, there is good reason to argue that at the root of biblical substitution is the act of pleading for divine favor on behalf of a guilty and antagonistic party. Related to the theme of substitutionary suffering and intercessory prayer is the key metaphor of “standing in the breach” for the sinful party.— ;Standing in the Breach, page 517