My opponent declares an attack. I say no fast effects. My opponent taps his masticore and a faery conclave to attack. I say fine. I state that I am declaring blockers. I activate my kjeldoran outpost to make a soldier token. He pings it in response to it coming into play. I am positive that this is not possible and tell him so. So he pings it when it comes into play. I declare it as a blocker in response. How does the timing work on this? Is it possible for me to declare the token as blocking the masticore and sac it to a martyrs cause to prevent the damage from the conclave? If so, what is the timing? Alternatively, what can he prevent by killing the token?