When Stormbringer deals lethal damage to all defending units and then moves a unit to that battlefield, what happens? Does combat/showdown occur, and what happens to hidden cards?

Ruling: The rules as written (RAW) do not properly handle this scenario - the game enters a locked state where combat cannot stage properly. This is a known rules issue awaiting fixes in version 1.3.

Sequence: (What happens RAW)

• Stormbringer deals damage and moves unit to battlefield
• Contested status is applied as part of the move action
• Cleanup occurs: defending units die
• Battlefield remains controlled (cannot lose control while contested)
• Showdown cannot stage (battlefield is controlled, not uncontrolled)
• Combat cannot stage (requires units from opposing players present simultaneously)
• Game locks in invalid state

Nuances:

• Rules As Intended (RAI): Combat should begin normally, or if units die first, it should become a regular showdown
• Hidden cards remain because control is never lost (battlefield stays controlled while contested)
• Temporary judge ruling recommendation: Allow combat to proceed normally until official fix
• Similar issue exists with Dragon's Rage in 3-player games
• Making Stormbringer a reflexive trigger would resolve the issue but doesn't fix the underlying rules problem