If you summon a Monarch and your opponent uses 'Torrential Tribute' do you still get to use the monarch's effect?

Answer 1

That'd be a misplay - you need to keep in mind player Priority. When the Monarch is summoned, the turn player still has Priority. He can use this for an Ignition Effect, or Quick Effect, or just pass Priority for the opponent to respond. Also, anything that triggers from the summon will activate first.

So when the Monarch is successfully summoned, the turn player has to pass Priority in one way or another before the opponent can do anything. In the case of Caius for example, Caius' mandatory effect will automatically become chain link 1 and pass Priority. For Mobius, his effect will be chain link 1 if the turn player wants to activate it, otherwise he retains Priority as above, or simply chooses to pass it. The opponent will then chain Torrential Tribute to this. Even though Torrential Tribute resolves and destroys the monarch first, his effect is still on the chain and will resolve as normal - assuming the target is still on the field, of course.

One last word on the scenario with Mobius - if the turn player chooses not to activate him, and the opponent does respond with Torrential Tribute, then the turn player has missed the chance to activate him. But to be clear, his turn player Priority gives him the choice to choose whether or not to use him, before the opponent gets chance to respond.