As a card in exile is not a permanent you control. Hope that helps explain things for you. To make sure it’s loud and clear: Yes, Teysa Karlov’s ability gets you an extra trigger on afterlife. The source of the trigger is the creature that last existed on the battlefield, not the card in your graveyard.

Does sacrificing a creature go on the stack?

You are correct the act of sacrificing something does not use the stack it is carried out as part of the instruction that directs you to do so regardless of whether it is part of a cost or the resolution of a spell or ability.

Does sacrifice trigger Teysa Karlov?

No, no, and sometimes! The exploit triggers are looking for a creature being sacrificed by the Exploit triggered ability, not just for something dying. Something does technically die, but the trigger condition for them is more specific, so it won’t get doubled from Teysa.

Can I sacrifice a creature twice?

No, you cannot do that. Everything to the left of the colon in an activated ability is a cost. You can only sacrifice the creature to satisfy the cost of one ability, not both. You would have to have two creatures to sacrifice in order to activate both abilities.

Can you double sacrifice a creature?

So to answer your actual question, you cannot “double dip” in this way. You can only sacrifice it for one effect.

What happens when Teysa Karlov leaves the battlefield?

For regular ‘leaves-the-battlefield’ triggers, the game can look back in time. Normal “when this thing dies” triggers and “Whenever a creature dies” triggers of your stuff will get doubled even if Teysa or the triggering permanent are going down. Let’s say you have four Blood Artist s and one Teysa Karlov, and your opponent decides that’s no bueno.

What do you get with Teysa Karlov 2wb?

For 2WB you get a 2/4 Legendary Human Advisor that gives all your creature tokens vigilance and lifelink, which is fairly spicy already- but her first ability is the heavy hitter, here. “If a creature dying causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time”.

Can a creature be doubled by Teysa Karlov?

No, no, and sometimes! The exploit triggers are looking for a creature being sacrificed by the Exploit triggered ability, not just for something dying. Something does technically die, but the trigger condition for them is more specific, so it won’t get doubled from Teysa.

Can a turntimber Sower trigger on Teysa Karlov?

For those, it will work, but only if Teysa herself and the triggering permanent are still on the battlefield immediately after the death of the creature that caused the trigger. So let’s say we have a Turntimber Sower on board, and an animated land like Treetop Village.