darke over at BGG noticed this in the FAQ (page 8):

Out of Play
Out of play is the deck, hand, and
discard pile zones.
If a card would go to an out of play
zone, it goes to its owner’s out of play
zone. A card that moves from an in
play zone to an out of play zone is
treated as though it were a new card.
Any effects connected to the card will
no longer affect it. The only exception
to this rule is any abilities that trigger
when a card moves from an in play
zone to an out of play zone.

So Iseara's granted Necromancy ability definitely won't stay with the unit if it goes to the discard. No need to ask James on this one.