When Briarhorn enters the battlefield, target creature gets +3/+3 until end of turn.
Evoke(You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)
4/15/2013 If you cast this card for its evoke cost, you may put the sacrifice trigger and the regular enters-the-battlefield trigger on the stack in either order. The one put on the stack last will resolve first.