Tashi and Annie, Dragontwins

As long as you control exactly one other creature with the same name as this creature, the legend rule does not apply to both of them.
{r}: Target creature gains +1/+0 flying, double strike, vigilance, trample, and haste until the end of turn. Activate this ability only if you control exactly one other creature with the same name as this creature.
It is funny how one spark can cause a fire