Can you use a reaction to increase a unit's might in response to Tibbers being played, before his 'deal 3 damage to all units' trigger resolves?

Ruling: You cannot react to a unit being played, but once Tibbers is in play, his trigger goes on the chain and you can react to that trigger, allowing you to increase a unit's might before the damage resolves.

Sequence:

• Tibbers is played and enters play
• Tibbers' trigger goes on the chain
• Players can now react to the trigger (e.g., increase a unit's might)
• The trigger resolves and deals 3 damage to all units