If I cast Imperial Decree into a Draven then run one Recruit Token into a battlefield with one opponent unit, will the Imperial Decree trigger kill the unit before the end of combat or would the Draven player draw a card from their legend ability?

Ruling: The Draven player will draw a card from their legend ability before Imperial Decree kills the unit. Combat damage is dealt during the Combat Damage Step, but the resulting "kill" trigger from Imperial Decree does not resolve until after the winner of combat has been determined.

Sequence:

• Combat damage is dealt simultaneously during the Combat Damage Step
• Imperial Decree's condition is met and its "kill" trigger is added to the chain as a Pending Item
• The trigger cannot resolve yet because the current game effect (Combat Damage Step) must finish completely first
• The game determines the winner of combat by checking the battlefield state
• At this moment, the Imperial Decree trigger is still on the chain and has not resolved, so units that survived the combat damage are still on the board
• Draven's "When you win a combat, draw 1" ability triggers and is added to the chain on top of the Imperial Decree trigger
• The chain resolves using Last In, First Out (LIFO): Draven's draw resolves first, then Imperial Decree's kill effect resolves

Nuances:

• There is a timing window between damage being dealt and the unit dying to Imperial Decree where end-of-combat checks occur
• This allows Draven to "see" the combat win before the board is cleared by the Decree's delayed effect
• The restriction preventing immediate resolution exists because current game effects must finish before the chain can proceed to its resolution steps