At the beginning of your combat phase, Xenagos triggers, giving Malignus +X/+X until end of turn, where X is Malignus's power.
Cast Chandra's Ignition by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing Malignus to deal damage equal to its power to each other creature and each opponent.
Each opponent loses the game due to having zero or less life.