Dedue, Dimitri's Vassal

Whenever a Samurai or Warrior you control
attacks alone, it gains lifelink until end of turn.
Sacrifice Dedue, Dimitri's Vassal: Another target
creature you control gets indestructible until end
of turn.
"I am always looking to assist His Highness, but sometimes I find myself at a loss. What more can I
do?"
(Selfless Samurai)