Turn 1: Plains taps for Sol Ring taps for Rakdos Signet.
Turn 2: Tap Plains and Sol Ring to float 1 white and two colorless mana. One colorless and tap to activate Rakdos Signet. Use the black from Rakdos Signet to cast Dark Ritual and gain 3 black mana. Two black to cast Lightning Greaves. One white, black, and red with the remaining colorless to cast Kaalia. Equip Lightning Greaves to Kaalia and swing, bringing out Master of Cruelties for game, assuming no blockers.
Turn 2: Tap Plains and Sol Ring to float 1 white and two colorless mana. One colorless and tap to activate Rakdos Signet. Use the black from Rakdos Signet to cast Dark Ritual and gain 3 black mana. Two black to cast Lightning Greaves. One white, black, and red with the remaining colorless to cast Kaalia. Equip Lightning Greaves to Kaalia and swing, bringing out Master of Cruelties for game, assuming no blockers.