Battlewise Warden

Chivalry 3 (When this creature attacks, you may tap
an untapped creature you control with lesser power. If
you do, this creature gets +3/+3 until end of turn.)
Other knights you control get +1/+1.
A Warden in battle is many things: Brave, fair,
and devout. Even if the call to battle may require
savagery and the will to mercilessly slaughter;
Wardens never let themselves fall to such
ignoble dishonor.