by The Detonator Thu Sep 02, 2010 11:16 pm
Lets make things clear shall we.
The End Phase is a very important step where many effects take place and many resolutions take place. During the End Phase it is the turn player who decides which effects resolve first. In this case, the turn player controls Yubel, and the non-turn player has Stardust Dragon in the Graveyard.
Lets notice importantly that the turn player control a Mandatorty Trigger Effect and the opponent controls a Optional Trigger Effect. Since the turn player has priority in the End Phase he gets to decide whether he wants to activate his Mandatroy Trigger Effect immediately or not.
--Player A enters the End Phase--
Player A can activate and resolve Yubel OR pass priority to his opponent.
Even though it is a Mandatory Trigger Effect you can pass priority and resolve it later but it will resolve regardless. Two things happen from this:
Option 1. Player A chooses to activate and resolve Yubel
Option 2. Player A chooses to resolve Yubel later, Player B can now activate Stardust Dragon OR pass Priority back to Player A.
Now we have a number of things that can happen. If player A chooses option 1. Then Player B can respond to the activation of Yubel with a card but cannot chain Stardust Dragon since the two effects are not happening at the same time. The only time trigger effects form a chain is if the happen at the exact same time, but the End Phase bends the rules and actually contains many substeps that do not allow for this to happen.
Following from Option 1:
1 a). Yubel resolves destroying all monsters on the field. Player B can now activate and resolve Stardust Dragon.
Now lets look at how option 2 could work. Player B has two choices here, he can pass priority back to player A or choose to activate and resolve Stardust Dragon.
Following from Option 2:
2 a). Player B activates and resolves Stardust Dragon. Priority is passed back to Player A who must now activate and resolve Yubel's effect.
2 b). Player B passes priority back to Player A who now must resolve Yubel's effect. When Yubels effect resolves, Player B can once again decide to activate Stardust Dragons effect.
With option 2 a). in this case, Stardust is summoned to the field before Yubel is activated and can chain itself once Player A is forced to activate Yubel's effect since he already passed Yubels effect once. With option 2 b). and since no more passing can be done. Mandatroy effects must now activate and resolve. Stardust Dragon like we said cannot chain its effect because it is not happening at the same time but in a different substep later in the End Phase so Yubel will go first and Stardust can be summoned after Yubel has fully resolved.
The key thing to remember is "whos turn is it?" and "does he want to pass his priority to me?" Mandatory effects can be passed only in the End Phase, and will instead activate after Player B has decided if he would like to activate his effects first.
So as a straight answer without all the mumbo jumbo, Stardust Dragon will not be able to chain its effect to Yubel if he wants to use Yubels effect before you can summon Stardust. If he doesnt, you can summon stardust and then he must use yubels effect which you can chain to so it all depends on what your opponent wants to do.
Always check on wikia before asking ruling questions, you will find the answer most of the time!
