Ball Lightning is a rare Creature — Elemental card from Masters 25 (A25), collector number 121. Current market price: $1.95 (foil $1.81), 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.