Shallowstalker Goblin

Madness {g}{u} (If you discard this card, you may
cast it for its madness cost instead of putting it into
your graveyard.)
When Shallowstalker Goblin enters the battle-
field, if you cast it for its madness cost, you may
have it fight target creature you don't control.
At the beginning of your end step, if you have no
cards in hand, return Shallowstalker Goblin from
the battlefield to its owner's hand.