When Stormbringer moves Volibear Furious to an enemy battlefield with Sett Kingpin and other buffed units, does it cause one cleanup or two cleanups, and can the opponent respond with Hidden Blade?

Question

Accepted Answer

Ruling: Stormbringer causes two cleanups in this situation. The first cleanup occurs after the move effect (killing units with lethal damage and reducing Sett Kingpin's might), and the second cleanup occurs after chain resolution (killing Sett Kingpin as a "zombie unit").

Sequence:
- Stormbringer resolves, moving Volibear Furious and marking 9 damage to everything
- First cleanup occurs, removing the 3 buffed units and reducing Sett Kingpin to 7 might with 9 damage marked
- Sett Kingpin temporarily survives as a "zombie unit" and combat is marked as pending
- Combat starts with Volibear Furious attacking
- Volibear's When Attacking ability triggers, creating an opportunity for Player 2 to use Hidden Blade
- Second cleanup would occur after chain resolution

Nuances:
- A cleanup that impacts the board will trigger another cleanup
- The "zombie unit" interaction (units that should be dead but temporarily survive) will be addressed in the next Comprehensive Rules Document