Zombie Knight Ally

"Liliana arrived just a few moments too late
to truly save Gideon from the overwhelming
horde of Eldrazi. Yet she did what she could,
calling upon Zendikar's defenders to rise again
as undead even as they fell. The last thing she
expected was for his spark to be preserved, and
even the portions of his mind left were unusual.
She's do the same for Nissa and Chandra, and
then Jace. Killing and raising him to preserve
what she could as madness took him and
mutation began to be mutated him."