Ball Lightning
Ball Lightning {R}{R}{R}
Creature - Elemental | Power/Toughness: 6 / 1
Trample (If this creature would deal enough damage to its blockers to destroy them, you may have it deal the rest of its damage to defending player or planeswalker.)

Haste (This creature can attack and {T} as soon as it comes under your control.)

At the beginning of the end step, sacrifice Ball Lightning.
Latest set: [M10] Magic 2010 (R)