He protects Prahlada from his father and married Prithvi after spending a thousand years battling with Hiranyaksha.
He filled five ponds with blood when he killed every member of a caste 21 times in revenge for the killing of Jamadagni. He once disguised himself as Mohini to trick the Asuras and while carrying a wooden umbrella, he takes three steps and grants Mahabali immortality.  He protects Prahlada from his father and married Prithvi after spending a thousand years battling with Hiranyaksha. At the end of time, he rides a white horse as Kalki, and to save the Vedas from the demon Hayagriva he took the form of the fish Matsya. For 10 points, name this Hindu god, who numbers a boar, a tortoise, and a dwarf among his avatars.
He filled five ponds with blood when he killed every member of a caste 21 times in revenge for the killing of Jamadagni.
{Vishnu} (Take {Rama}-{with}-{the}-{axe} or {Parashurama;} take {Vamana, Varaha,} or {Narasimha})