Tabris, The Final Angel

Flying, Hexproof, Protection From Green
Tabris, The Final Angel is also treated as
Kaworu Nagisa, 5th Child
(Both cards can be in the same library)
Toughness is equal to X.
Tabris, The Final Angel can only be killed
if it receives damage equal to its entire toughness
from one creature.
"The fate of man... The hope of man is written in
sorrow."