Berserker Soul

When Berserker Soul is cast discard all cards in
your hand, and you can't active their discard
abilities. Target creature you control with 4 or
less power deals damage equal to its power to
target opponent, then you draw a card and reveal
it. If the card you draw is a creature with 4 or
less power, you may repeat this process but with
the same creature. Exile Berserker Soul, then you
lose the game during your next end step.
Limited 1