Splashing Black for a 1 of Rakdos, The Showstopper Isn't really a big deal. Just a big board wipe and huge Flyer if we cant finish with our rush of burn.
You can activate spectacle by playing them and the beginning of your upkeep before your untap ex. Turn 1 Mountain, Turn 2 Shock before Untap Spectacle is available for Skewer the Critics, or Light up the Stage.