Tamsyn Sweene, Dimir Agent

Deathtouch
Whenever a creature dealt damage by Tamsyn
Sweene, Dimir Agent dies this turn you may
have Tamsyn Sweene, Dimir Agent become a
copy of that creature. It gains this ability
and is unblockable by the original creature's
controller.
"They went gently, peacefully. It's not like we're
complete monsters."