Edelgard, Adrestian Emperor

Partner with Byleth, Perceptive Mentor
Whenever Edelgard, Adrestian Emperor attacks,
put a +1/+1 counter on all creatures you control,
then Edelgard, Adrestian Emperor deals damage
equal to the number of attacking creatures to
the defending player.
"I will create a world where all people are free, regardless of their bloodline..."