Rakdos Lizards is an aggressive low-curve deck with lots of burn and small creatures backed by Burst Lightning and Stingerquill Charm, so Origin of Metalbending's indestructible mode is key to keeping your blockers and attackers alive through their removal suite. Warg Tactics' pump mode (trample, hexproof) helps you win combat and dodge their removal when racing. Cut the tutor lands and Snakeskin Veil since Origin of Metalbending covers similar protection while also offering artifact/enchantment destruction utility against nothing relevant here, but the indestructible mode alone justifies the slot.