Amyr, Raging Storm

Whenever a Samurai or Warrior you control
attacks alone, you may pay 1. When you do,
attach Amyr, Raging Storm to it.
Equipped creature gets +2/+1.
Equip {3}
"A Crest Stone weapon designed to Edelgard's specifications allowing her to use Raging Storm."
(Ancestral Katana)