I: Xemnas

(Organization XIII)
Vigilance
Whenever this creature deals combat damage to
an opponent, you may sacrifice another Nobody
you control. If you do, this creature gets +X/+X
until the end of your next turn, where X is the sacrificed creatures toughness. If the sacrificed creature had (Organization XIII) in its text, put
X +1/+1 Counters on this creature instead.