Magnolia Pictures has acquired U.S. rights to Kusama – Infinity, the Heather Lenz documentary about famed Japanese artist Yayoi Kusama. The pic premiered over the weekend in the U.S. Documentary Competition at the Sundance Film Festival. Kusama, who grew up up in Japan during World War II, overcame life in a dysfunctional family that discouraged her creative ambitions, sexism and racism in the art establishment, mental illness in a culture where that was a particular…