Jarael, the Ivory Knight

Lifelink
Chivalry 1 (Whenever this creature attacks, you may
tap an untapped creature you control with lesser power.
If you do, this creature gets +1/+1 until end of turn.)
You may tap untapped creatures you don't
control with Jarael, the Ivory Knight's chivalry
ability as though you controlled them.
He defends even his foes from their own folly.