If I start a contested showdown with a 1M unit then my opponent responds with Rengar Trophy Hunter then I stun Rengar what will the outcome of the Showdown be?
To determine the outcome of your showdown, we must follow the sequence of events and apply the combat rules as they stand after you stun Rengar, Trophy Hunter.
The Sequence of Events
- Initial Move: You move your unit (1 Might) to an empty, uncontrolled battlefield. The battlefield becomes Contested. You are designated the Attacker (Rule 442.1.a.1).
- Opponent's Response: Your opponent plays Rengar, Trophy Hunter as a [Reaction] to the contested battlefield. Upon entering, they become the Defender (Rule 442.1.a.2).
- Your Response: You play Back Off as a [Reaction], targeting Rengar, Trophy Hunter. He becomes Stunned.
- Transition to Combat: The chain empties, both players pass focus, and the non-combat showdown transitions into a Combat Showdown (Rule 459.2).
Combat Resolution
- Combat Damage Step:
- Your unit deals 1 damage to Rengar.
- Because Rengar is Stunned, he does not contribute his Might to damage (Rule 423.1.b). He deals 0 damage to your unit.
- Combat Cleanup (Recall):
- Units heal (Rule 461.1.a.1).
- Recall: According to Rule 461.1.a.2, attacking units are recalled to their controller's base if a defender is still present at the battlefield.
- Since your unit (the Attacker) survives (it took 0 damage) and Rengar (the Defender) is still present at the battlefield, your unit is recalled to your base.
Final Outcome
- Rengar, Trophy Hunter: Remains on the battlefield.
- Your Unit: Recalled to your base.
- Conquer: Because your opponent is the only player with a unit remaining at the battlefield during the Resolution step, they establish control and successfully conquer the battlefield (Rule 461.5).
Summary: Even though you stunned Rengar, because he remained on the battlefield after combat damage, your attacking unit is recalled to your base during the combat cleanup. Your opponent effectively wins the showdown and conquers the battlefield.