Trample (If this creature would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.)
Haste (This creature can attack and as soon as it comes under your control.)
At the beginning of the end step, sacrifice Ball Lightning.
P / T
6 / 1
Flavor
The most frightening storms are those not woven by nature’s hand.