Ball Lightning is a rare Creature — Elemental card from Magic 2010 (M10), collector number 125. Current market price: $0.62 (foil $4.87), TCGplayer market prices via Scryfall.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Haste (This creature can attack and {T} as soon as it comes under your control.) At the beginning of the end step, sacrifice this creature.