In one story, this god competes against fire in an eating contest that was rigged by a similarly named figure "of the Outyards." He takes the form of a mare in order to prevent the completion of a wall, which causes him to get pregnant and give birth to an eight-legged horse. He impersonates a giantess and refuses to weep for Balder's death, which he had previously caused by telling the blind god 
In one story, this god competes against fire in an eating contest that was rigged by a similarly named figure "of the Outyards." He takes the form of a mare in order to prevent the completion of a wall, which causes him to get pregnant and give birth to an eight-legged horse. He impersonates a giantess and refuses to weep for Balder's death, which he had previously caused by telling the blind god Hoder throw some mistletoe. By the giantess Angrboda, he fathered the giant serpent Jörmungand and the wolf Fenrir. For 10 points, name this Norse trickster god.
In one story, this god competes against fire in an eating contest that was rigged by a similarly named figure "of the Outyards."
Loki