Bloodmoon Shinobi

When Bloodmoon Shinobi enters the battlefield initiate a Duel with another creature (Two creatures fight, but it creates a duel step where instants and sorceries may be cast before damage is dealt)
when Bloodmoon Shinobi wins a duel give it +3/+3 and it gains lifelink until end of turn, then you may have it Duel another Creature and opponent controls