when does which effects end?

[ipconfig]

Hello,

I want to know something:
When does which effect end?

A Basic question:
I play Dredge and have 2 Bridge from Below im my Graveyard

Bridge from Below:
Whenever a nontoken creature is put into your graveyard from play, if Bridge from Below is in your graveyard, put a 2/2 black Zombie creature token into play.  When a creature is put into an opponent’s graveyard from play, if Bridge from Below is in your graveyard, remove Bridge from Below from the game.

Im in my turn and i am going to attack with two Ichorids and my opponent is blocking with 2 1/1 Creatures.
How is deceided which Creatures will go in the GY first?
What happens if my opponent has 2 Bridge from Below in his Graveyard too?


A 2nd Question similar to the first one:
I have a Necropotence and a Memory Jar in play

Necropotence:
Skip your draw step. ; If you would discard a card, discard it, but remove that card from the game instead of putting it into your graveyard. ; Pay 1 life: Remove the top card of your library from the game face down.  Put that card into your hand at the end of your turn.

Memory Jar:
,Sacrifice Memory Jar: Each player removes his or her hand from the game face down and draws seven cards.  At end of turn, each player discards his or her hand and returns to his or her hand each card he or she removed from the game this way.

If i use the Mameory Jar and the use the Necro effect. What will happen at the end of my turn?
May i stack them both as i want since i am the controller of both?
What would happen if i have the Jar and my opponent has necro?
Case a) i sac jar in my turn b) i sac jar in my opponents turn?

[Nefarias]

I've never been able to wrap my head around the intricacies of Memory Jar, so I'm gonna leave that one alone, but I can field the Ichorid question.

Three basic things you need to keep in mind:

-Except in the case of First Strike (or Double Strike), all combat damage resolves at the same time and all creatures die simultaneously
-When you control multiple triggers that trigger at the same time, you decide how to put them on the stack and they will resolve in "First In, Last Out" order. The simplest example is multiple "At the beginning of your upkeep" triggers, but your example works too.
-When triggers controlled by both your opponent and yourself trigger at the same time, they will go on the stack in APNAP (Active Player, NonActive Player) order. So yours will go on the stack first, with your opponent's on top of that (meaning his will resolve first).

So in the first example, the two Ichorids and the two 1/1's die simultaneously, and both of Bridge's abilities will trigger (The first one will trigger twice) for each Bridge. You can control the order. Presumably, you want the "Remove from game" ability to trigger first, with the "Get guys" trigger on top of that. So the stack can look something like this:

Bottom
Remove Bridge 2 from the game
Remove Bridge 1 from the game
Get a creature 2B
Get a creature 2A
Get a creature 1B
Get a creature. 1A
Top

If your opponent has Bridges as well, your triggers will go on the stack first, with his on top of that. Each player decides on the order of their own triggers.  That stack would probably look something like this:

Bottom:
You remove Bridge 2
You remove Bridge 1
You get a creature 2B
You get a creature 2A
You get a creature 1B
You get a creature 1A
Opponent remove Bridge 2
Opponent remove Bridge 1
Opponent gets a creature 2B
Opponent gets a creature 2A
Opponent gets a creature 1B
Opponent gets a creature 1A
Top

End result: You and your opponent each get 4 Zombies, and have no bridges left. He gets his slightly before you.

[Clariax]

In the case of the Bridges from Below there will be 2 "Remove this from the game" triggers for each bridge.  Other than that, Nefarias's answer is correct.

For Necro and Memory Jar, both triggers are again trying to go on the stack at the same time.  If you control both, you get to choose the order they go on the stack.  If one player controls each, the active player's trigger goes on the stack first.

[Godder]

Does Necropotence saying "put that card into your hand at the end of your turn" affect anything?

[Clariax]

If it's the Necropotence controller's turn, it won't change anything.  The triggers still try to go on the stack at the same time.  If it's not the Necro controller's turn, there won't be any trigger at all.

Does Necropotence saying "put that card into your hand at the end of your turn" affect anything?

[Godder]

That's what I thought - the reason I asked is because the original post had two cases, one for each player's turn, with the same player controlling Necropotence in each case.

[ipconfig]

So in the case i have necro and my opponent has memory jar and i am the active player:
i try to "draw" 10 cards.
My opponent sacrifices the memory jar (as i understood it doesent matter if he does it in response or not):

at the end of my turn i will get the cards back set aside with memory jar and then i will get the 10 cards from necro?
since both effects are "at the end" and it goes APNAP

<top>
memory jar (Opponent as non active player)
necro (me as active player)
<bottom>

resolving from top to bottom...

[Godder]

That's correct.