What I'm hoping to do is to use Welder's ability during my opponent's upkeep so that I can swap Tangle Wire for Possessed Portal. Thus forcing them to tap 4 permanents to Tangle Wire and also skip their draw. I'm pretty certain this is legal but I'm not sure how I would word it to my opponent in a tournament. Am I correct that this is legal? If so, how do I word it?
Next question:
Now suppose I do this and I actually happen to have a second untapped Goblin Welder in play, my opponent can't do anything so they pass the turn. During his/her end step we now both have to sacrifice a permanent or discard to the Portal. Is there some sort of ruling concerning the stack that would force my opponent to sac/discard and I in response swap Portal for something else in the yard using my second Welder and not have to sac/discard?
My thoughts are that this doesn't work and that my best bet would be to just sac the Portal to itself and weld it back into play again on their next turn.
For your first question: Yes this is allowed. Here's how it works:
Assume you control Tangle Wire with four fade counters on it, and that you control Goblin Welder and have a Possessed Portal in your graveyard. Your opponent's upkeep begins and Tangle Wire's second ability triggers. You put that ability on the stack.
You activate Goblin Welder's ability, targeting Tangle Wire and Possessed Portal, respectively.
All players pass, then that ability resolves. You sacrifice Tangle Wire and bring Possessed Portal to the battlefield simultaneously.
All players pass, then the Tangle Wire ability resolves. Even though Tangle Wire is no longer on the battlefield, your opponent must "ta[p] [four] untapped artifact[s], creature[s], [and/or] land[s]" they control, since four fade counters were on Tangle Wire at the last moment it was on the battlefield (C.R. 608.2h; see also this thread and this thread).
All players pass, then the game moves to the draw step. Since Possessed Portal is on the battlefield, your opponent must skip drawing a card as that step begins.
(Note that the last step has all players pass. In fact your opponent will eventually get priority and could use it to cast a spell or activate an ability [such as a spell that would remove Possessed Portal from the battlefield], rather than pass [C.R. 117.4, 117.1a-b, 117.3d].)
On your second question: It won't work the way you want. Once Possessed Portal's triggered ability triggers, it will get to resolve even if Possessed Portal leaves the battlefield in the meantime (C.R. 113.7a). And once it resolves, each player, not just your opponents, must "sacrific[e] a permanent unless they discard a card", even if Possessed Portal isn't on the battlefield at that time. Note also that players don't have priority to cast spells or activate abilities (such as Goblin Welder's ability) while another spell or ability (such as Possessed Portal's triggered ability) is resolving (C.R. 117.2e, 117.1a-b).
Small point in peteroupc's sequence - you don't necessarily need to use the Welder in response to the Tangle Wire trigger. If you let the Tangle Wire resolve first, both players should gain priority before it moves to the Draw Step, so you have a window to Weld the Portal in before they would draw.
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Suppose I have a Tangle Wire with 4 counters on it, and a Goblin Welder in play, with a Possessed Portal in the graveyard.
What I'm hoping to do is to use Welder's ability during my opponent's upkeep so that I can swap Tangle Wire for Possessed Portal. Thus forcing them to tap 4 permanents to Tangle Wire and also skip their draw. I'm pretty certain this is legal but I'm not sure how I would word it to my opponent in a tournament. Am I correct that this is legal? If so, how do I word it?
Next question:
Now suppose I do this and I actually happen to have a second untapped Goblin Welder in play, my opponent can't do anything so they pass the turn. During his/her end step we now both have to sacrifice a permanent or discard to the Portal. Is there some sort of ruling concerning the stack that would force my opponent to sac/discard and I in response swap Portal for something else in the yard using my second Welder and not have to sac/discard?
My thoughts are that this doesn't work and that my best bet would be to just sac the Portal to itself and weld it back into play again on their next turn.
(Note that the last step has all players pass. In fact your opponent will eventually get priority and could use it to cast a spell or activate an ability [such as a spell that would remove Possessed Portal from the battlefield], rather than pass [C.R. 117.4, 117.1a-b, 117.3d].)
On your second question: It won't work the way you want. Once Possessed Portal's triggered ability triggers, it will get to resolve even if Possessed Portal leaves the battlefield in the meantime (C.R. 113.7a). And once it resolves, each player, not just your opponents, must "sacrific[e] a permanent unless they discard a card", even if Possessed Portal isn't on the battlefield at that time. Note also that players don't have priority to cast spells or activate abilities (such as Goblin Welder's ability) while another spell or ability (such as Possessed Portal's triggered ability) is resolving (C.R. 117.2e, 117.1a-b).
EDIT: Edited after comment 3 was posted.