Stormfly, Deadly Nadder

Flying, double strike, haste

{x}{u}: Put X spine counters on Stormfly.
{r}, {t}: Remove all spine counters from Stormfly. Deal X damage divided as you choose to up to three target creatures, players, or planeswalkers where X is the number of spine counters removed from Stormfly.

Partner(You can have two commanders if both have partner.)