Birkorvik, Slayer of Fools

You may pay {2}{g/w} rather than pay Birkorvik's
mana cost. If you did this, when Birkorvik enters
the battlefield, return it to your hand and create
a 2/2 green and white Knight token with
vigilance named "Foolish Slayer."
Flying
{1}{r}: Birkorvik gets +2/+0 until end of turn.
{2}{b}, Sacrifice a creature: Target opponent loses
life equal to its toughness.