If I react to my own 'when I defend' trigger with Hostile Takeover to steal an enemy unit with a 'when I defend' ability, does the stolen unit's 'when I defend' trigger also activate before Reavers Row resolves?

Ruling: Yes, when you use a hidden Hostile Takeover in reaction to your own unit's 'when I defend' trigger, the stolen unit gains the defender designation and its 'when I defend' ability triggers before Reavers Row resolves.

Sequence:

• Your unit is declared as defender, triggering its 'when I defend' ability
• Opponent gets priority and passes
• You get priority and play hidden Hostile Takeover, selecting the enemy unit (e.g., Draven)
• Both players pass priority
• Hostile Takeover resolves and you gain control of the enemy unit
• The stolen unit gains the defender designation, triggering its 'when I defend' ability
• The stolen unit's trigger goes on the chain above the original Reavers Row trigger
• Chain resolves with the stolen unit's ability first, then Reavers Row

Nuances:

• Hostile Takeover must be hidden to be played with react speed during opponent's turn, as it can normally only be played on your turn
• The 'when I defend' triggers are not missed because you gain control of the unit before Reavers Row resolves