Boros Challenger

ボロスの挑戦者 (Boros Challenger) (ja)

Creature - Human Soldier | Power/Toughness: 2 / 3 (CMC 2)
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
: Boros Challenger gets +1/+1 until end of turn.