Brunhilda, the Flamewyrm

Trample
Shapeshift {2}{r} ({2}{r}, Exile an attacker you
control until Brunhilda, the Flamewyrm leaves
the battlefield. Put this card onto the battlefield
from your hand tapped and attacking.)
When Brunhilda, the Flamewyrm enters the
battlefield, if it entered tapped deal 3 damage to
each creature your opponent controls.
"I'll burn them to ash!"