When Promising Future is played and both players choose to play Time Warp, whose extra turn happens first?

Ruling: The opponent's extra turn happens first, followed by the Promising Future player's extra turn.

Sequence:

• Promising Future resolves, starting with the next player (opponent)
• Opponent's Time Warp goes on the chain first
• Promising Future player's Time Warp goes on the chain second
• Chain resolves in reverse order: Promising Future player's Time Warp resolves first, then opponent's
• The most recently resolved Time Warp's extra turn happens first
• Therefore: opponent gets the first extra turn

Nuances:

• This is an open rules question with no official ruling in the current rules
• There are no explicit rules about how extra turns are ordered or inserted into turn sequence
• Some argue extra turns could work as delayed triggers instead of being inserted
• The answer provided is the most commonly accepted interpretation, but ultimately depends on head judge ruling