So, just to get my timing right on this:
When my opponent casts a spell, and I interrupt him directly after
Step 1 (Cast Spell) or
Step 2 (Counter Spell) and pay the Reveal Cost for "Magebane" on him, would he then take damage after
Step 3 (Resolve Spell)? He can't take the spell back, once it's cast, can he? And Magebane only triggers after
Step 3 has been resolved, as far as I know.
Thanks!