Lingering Duelist

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.)
Lingering Duelist can't block.
You may exile a creature card with lesser power
from your graveyard rather than tap an untapped
creature you control with Lingering Duelist's
chivalry ability.