Bjorn, Lord of Storms

When Bjorn, Lord of Storms enters the battlefield, deal 3 damage to any target.
Protection from Cowards
{1}{r/g},{t}: Challenge target creature, it's controller chooses one:
• Bjorn, Lord of Storms fights targeted creature
• Targeted creature is a Coward in addition to its other types, and Bjorn, Lord of Storms deals 3 damage to its controller