All that Clavileo needs is a consistent way of offing his own Vampires once they've attacked

Creatures (23) 1 Myr Retriever 1 Solemn Simulacrum 1 Goblin Welder 1 Broodstar 1 Trinket Mage 1 Auriok Salvagers 1 Arcbound Crusher 1 Disciple of the Vault 1 Sharding Sphinx 1 Filigree Angel 1 Wurmcoil Engine 1 Thopter Assembly 1 Pia and Kiran Nalaar 1 Hangarback Walker 1 Smothering Abomination 1 Filigree Familiar 1 Master Trinketeer 1 Metalwork Colossus 1 Reckless Fireweaver 1 Marionette Master 1 Scrap Trawler 1 Treasure Keeper 1 Maverick Thopterist Planeswalkers (3) Lands (28) 3 Plains 3 Swamp 2 Mountain 3 Island 1 Vault of Whispers 1 Seat of the Synod 1 Great Furnace 1 Ancient Den 1 Vivid Creek 1 Vivid Meadow 1 Arcane Sanctum 1 Crumbling Necropolis 1 Rupture Spire 1 Bojuka Bog 1 Transguild Promenade 1 Nomad Outpost 1 Mystic Monastery 1 Myriad Landscape 1 Foundry of the Consuls 1 Inventors' Fair 1 Spire of Industry Spells (45) 1 Sol Ring 1 Meekstone 1 Darksteel Ingot 1 Skullclamp 1 Wayfarer's Bauble 1 Summoning Station 1 Salvaging Station 1 Roar of Reclamation 1 Grinding Station 1 Blasting Station 1 Nuisance Engine 1 Dimir Signet 1 Terrarion 1 Izzet Signet 1 Orzhov Signet 1 Azorius Signet 1 Rakdos Signet 1 Chromatic Star 1 Coalition Relic 1 Scourglass 1 Relic of Progenitus 1 Open the Vaults 1 Expedition Map 1 Elixir of Immortality 1 Brittle Effigy 1 Furnace Celebration 1 Nihil Spellbomb 1 Spine of Ish Sah 1 Ichor Wellspring 1 Mycosynth Wellspring 1 Conjurer's Closet 1 Trading Post 1 Dictate of Erebos 1 Thopter Spy Network 1 Tamiyo's Journal 1 Magnifying Glass 1 Confirm Suspicions 1 Underhanded Designs 1 Renegade Map 1 Implement of Combustion 1 Implement of Examination 1 Hidden Stockpile 1 Efficient Construction 1 Universal Solvent 1 Servo Schematic The thing which jumped out and grabbed me is that hes running 28 lands

For example, lets take that longer search above where were essentially looking for a commander with Blue in its identity that cares about flying, combat damage, and drawing cards
The final card is, naturally, Sol Ring, the most-played card in Commander
which the deck is sure to be stacked with
The name perfectly encapsulates the effect - it counters any target spell, period