Rampaging Ghoul

Haste (This creature can attack and {t} as soon as it comes under your control.)
Madness {0} (If you discard this card, you may cast
it for its madness cost instead of putting it into your graveyard.)
When Rampaging Zombie enters the battlefield, if its Madness cost was paid, it gets +1/+1 and gains first strike until end of turn.