If a unit with 5 might takes 4 damage from Voidseeker, then has its might reduced by Stupefy on a new chain, does the unit die or stay at 1 hp?

Ruling: The unit would die. After Stupefy resolves, a cleanup happens and the game checks if the unit's damage meets or exceeds its (now reduced) might.

Sequence:

• Voidseeker resolves, dealing 4 damage to the unit with 5 might
• On a new chain, Stupefy is cast and resolves, reducing the unit's might
• A cleanup happens and checks the damage against the new might value
• The unit dies because the damage now meets or exceeds its reduced might