From everything we have seen so far, this release is shaping up to be one of the biggest of the year across games, video, and tabletop
Use the Lotus to tap for triple black, then untap it for one mana with the Staffs first ability, draw your entire deck (thanks to Staff of Domination), cast an infinitely large Exsanguinate or Torment of Hailfire and youre done
1 Space Marine Devastator 1 Triumph of Saint Katherine 1 Ultramarines Honour Guard 1 Vexilus Praetor 1 Zephyrim 1 And They Shall Know No Fear 1 Grey Knight Paragon 1 Space Marine Scout 1 Thunderwolf Cavalry 1 Bastion Protector 1 Collective Effort 1 Deploy to the Front 1 Entrapment Maneuver 1 Fell the Mighty 1 Hour of Reckoning 1 Launch the Fleet 1 Martial Coup 1 Swords to Plowshares Black (3) 1 Arco-Flagellant 1 Primaris Eliminator 1 Sanguinary Priest Multi colored (19) 1 Marneus Calgar 1 Assault Intercessor 1 Belisarius Cawl 1 Birth of the Imperium 1 Callidus Assassin 1 Commissar Severina Raine 1 Company Commander 1 Cybernetica Datasmith 1 Epistolary Librarian 1 Exterminatus 1 The Flesh Is Weak 1 Inquisitor Eisenhorn 1 Neyam Shai Murad 1 Sister Hospitaller 1 Sister Repentia 1 Deny the Witch 1 Primaris Chaplain 1 Utter End 1 Mortify Colorless (52) 1 The Golden Throne 1 Inquisitorial Rosette 1 Knight Paladin 1 Reaver Titan 1 Redemptor Dreadnought 1 Thunderhawk Gunship 1 Everflowing Chalice 1 Choked Estuary 1 Darkwater Catacombs 1 Exotic Orchard 1 Port Town 1 Prairie Stream 1 Skycloud Expanse 1 Sunken Hollow 1 Mind Stone 1 Skullclamp 1 Sol Ring 1 Talisman of Dominance 1 Talisman of Hierarchy 1 Talisman of Progress 1 Arcane Sanctum 1 Ash Barrens 1 Memorial to Glory 1 Arcane Signet 1 Commander's Sphere 1 Command Tower 1 Dismal Backwater 1 Evolving Wilds 1 Path of Ancestry 1 Scoured Barrens 1 Terramorphic Expanse 1 Tranquil Cove 5 Island 7 Swamp 8 Plains 1 (4) 1 Launch the Fleet 1 Swords to Plowshares 1 Skullclamp 1 Sol Ring 2 (8) 1 Inquisitorial Rosette 1 And They Shall Know No Fear 1 Martial Coup 1 Mind Stone 1 Talisman of Dominance 1 Talisman of Hierarchy 1 Talisman of Progress 1 Arcane Signet 3 (11) 1 Defenders of Humanity 1 Arco-Flagellant 1 Assault Intercessor 1 Commissar Severina Raine 1 Cybernetica Datasmith 1 Space Marine Scout 1 Sicarian Infiltrator 1 Bastion Protector 1 Collective Effort 1 Mortify 1 Commander's Sphere 4 (18) 1 For the Emperor
The idea was to do an incredible amount of damage to your own Reckoner, and then pass that damage along to your opponent thanks to Reckoner's ability
Clavileo also gives them a second ability that if that creature dies, you get a 4/3 token with flying and you draw a card
Summing Up As a result, the Commander format is a popular casual format of Magic: The Gathering
