Conjurer's Closet

[Avodroc13]

If I had 3 {Conjurer's Closet}s and {Jace's Mindseeker} on the field, does the Mindseeker's ability activate 3 different times from the Closets at the beginning of the end step?
Or do I exile and return 3 separate creatures due to the 3 separate closets happening all at once?

Please explain how it would work.

[Pleeb]

Each closet will trigger separately. When the triggers are put on the stack, you choose the target. You may choose the same target for each trigger; however, once a creature changes zones, anything that was targeting it loses track of the creature (except the effect that caused it to change zones). You can only flash any given creature once per end step.

[Avodroc13]

So the 3 closets COULD target the Mindseeker, but only 1 would be effective?

[Pleeb]

403.4.: Whenever a permanent enters the battlefield, it becomes a new object and has no relationship to any previous permanent represented by the same card, except for the cases listed in rule 400.7. (This is also true for any objects entering any zone.)

They are brand new objects. The other objects on the stack are countered because they no longer have a legal target.

Yes, effectively only the first one works.

[ibtrickey]

Only 1 effect:) conjure is okay for etb effects but you only can use it 1-1