When revealing a unit from hidden (like Teemo Strategist), does it open up a chain that can be reacted to before the unit resolves?

Ruling: Units played from hidden do enter the chain but immediately resolve without passing priority to opponents. Opponents cannot react to the unit itself being played, but can react to any triggered abilities the unit creates when it enters play.

Sequence:

• Unit enters the chain as a pending item
• Unit immediately leaves the chain and becomes a game object (resolves)
• Priority does not pass after the unit resolves
• If the unit has a triggered ability (like Teemo), that ability goes on the chain and passes priority for opponents to react

Nuances:

• Units without triggered abilities give no opportunity for opponent interaction
• You need priority to react, which requires reaching the Execute step, but this is skipped for units
• Only triggered or activated abilities from the unit will pass priority to opponents