In a match, if Player A wins game 1, and then game 2 results in a draw, will both players have to go into a game 3?

I've heard multiple answers, and I'm just curious what the real answer is.

Yes, a draw doesn't count as a win. Matches are won by winning two games out of the match.

Here's an argument that I want to solve from a casual game. Player A Special Summons Chaos Emperor Dragon - Envoy of the End, to which player B activated Assault Mode Activate to bring out Stardust Dragon/Assault Mode. Player A then chose to activate CED's reset effect, and in response player B activates SD/AM's effect. This caused a long argument which left neither player happy at the end. My question is simple. Which card has priority when activating the effect??

It depends on the general situation. From the way you described, it would go like...

Player A Special Summons Chaos Emperor Dragon

Chain Link 1 - Player B responds to the Special Summon by activating Buster Mode, Tributing Stardust Dragon to activate.

Player A - No response.


Chain resolves...


Chain Link 1 - Buster Mode resolves, Special Summoning Stardust Dragon/Buster.



Then Player A is choosing to start a NEW Chain by activating Chaos Emperor Dragon's effect...

Chain Link 1 - Player A pays 1000 Life Points to activate Chaos Emperor Dragon's effect.

Chain Link 2 - Player B chains by Tributing Stardust Dragon/Buster to activate its effect.

Player A - No response.

Chain resolves...

Chain Link 2 - Player B's Stardust Dragon/Buster resolves, negating the activation of Chaos Emperor Dragon and destroying it.

Chain Link 1 - As Player A's Chaos Emperor Dragon's activation was negated and it was destroyed, its effect is not resolved; no cards are sent from the hand or field to the Graveyard and no damage is dealt to Player B.




However, if you're saying that Player B activated Buster Mode in a Chain to Chaos Emperor Dragon's effect activation and not the Special Summon then...

Chain Link 1 - Player A pays 1000 Life Points to activate Chaos Emperor Dragon's effect.

Chain Link 2 - Player B chains by Tributing Stardust Dragon to activate Buster Mode.

Player A - no response.


...the chain would resolve as such...



Chain Link 2 - Buster Mode resolves and Stardust Dragon/Buster is Special Summoned.

Chain Link 1 - Chaos Emperor Dragon's effect resolves, sending all cards on the field and in both player's hands to the Graveyard and inflicting 300 damage to Player B for each card sent.

As Stardust Dragon/Buster must be directly chained to the activation of the card you intend to negate coupled with the current Chain was still in the middle of resolving (you cannot add in new activations in the middle of an already-resolving Chain unless rulings allow something to happen), then Stardust Dragon/Buster could not be activated to negate Chaos Emperor Dragon's activation as by the time it was Special Summoned, it was in the middle of an already-resolving Chain and the window of timing to negate Chaos Emperor Dragon's activation has closed.