You can pay 2U to simply cast it as a 2/2 creature with no effects or you can play it face down as a 2/2 creature for 3
Shoot, you can even Reality Shift your own stuff, especially if you know what's on top of your library (via Soothsaying or some such)
Ok Davros, Dalek Creator [Foil] #998 (Magic Doctor Who) Details All prices are the current market price

Agent of Treachery Animus of Night's Reach Archon of Valor's Reach Barrier Breach Boseiju Reaches Skyward Breach Breach the Multiverse Breaching Dragonstorm Breaching Hippocamp Breaching Leviathan Cloudreach Cavalry Coastal Breach Containment Breach Dimensional Breach Fungal Reaches Geier Reach Bandit Geier Reach Sanitarium Honden of Night's Reach Hull Breach Hullbreacher Kodama's Reach Lavaclaw Reaches Luxknight Breacher Mana Breach Myojin of Night's Reach Preacher Preacher of the Schism Reach Through Mists Reach for the Sky Reach of Branches Reach of Shadows Reach the Horizon Scourge of Geier Reach Screamreach Brawler Shackles of Treachery Skyreach Manta Song-Mad Treachery Starbreach Whale The Long Reach of Night Through the Breach Treacherous Blessing Treacherous Greed Treacherous Link Treacherous Pit-Dweller Treacherous Terrain Treacherous Trapezist Treacherous Urge Treacherous Vampire Treacherous Werewolf Treachery Undercity Reaches Underworld Breach Valor's Reach Valor's Reach Tag Team Vayne's Treachery Wanderbrine Preacher Wolf of Devil's Breach

It taps for one colorless mana, but you can pay 1 mana, tap and sacrifice it to destroy target nonbasic land an opponent controls
Honorable Mentions: 1-Life Cards There are a few cards that just barely miss the mark when it comes to an auto-kill, instead leaving the opponent at 1 life