Ruby cards focus on offensive strategies, like using the Rush (able to challenge the turn the character is played) and Evasive (only allowing other Evasive ability characters to attack the character) abilities
For general card quality, utility and synergy Library is quite significantly better than Demonic Tutor but it is even slower and clunkier to get online
Exploiting Commander's increased starting life total of 40 to gain a massive amount of card advantage over your opponents is par for the course in mono-black decks
Aboleth Spawn Abomination of Gudul Advanced Stitchwing Atraxa, Praetors' Voice Awoken Horror Captain N'ghathrod Chained Throatseeker Chasm Skulker Clammy Prowler Cleaver Skaab Consuming Aberration Cruel Witness Dinrova Horror Docent of Perfection Dreadlight Monstrosity Drownyard Amalgam Etherium Abomination Forgotten Creation Geralf's Masterpiece Geralf's Mindcrusher Grazilaxx, Illithid Scholar Grell Philosopher Havengul Skaab Hordewing Skaab Horrid Shadowspinner Hullbreaker Horror Illithid Harvester Ingenious Skaab Kederekt Creeper Kraum, Ludevic's Opus Kraum, Ludevic's Opus Kraum, Violent Cacophony Krothuss, Lord of the Deep Laboratory Brute Laboratory Drudge Lamplighter of Selhoff Ludevic's Abomination Makeshift Mauler Mind Flayer Mindleech Mass Mindwrack Liege Murkfiend Liege Nemesis of Reason Nihiloor Overcharged Amalgam Overlord of the Floodpits Patchwork Crawler Perfected Form Pink Horror Possessed Aven Psychic Symbiont Renegade Silent Rootcoil Creeper Sauron, Lord of the Rings Sauron, the Dark Lord Screaming Swarm Silent Hallcreeper Skaab Ruinator Sludge Monster Stitched Mangler Stitchwing Skaab Storm Skreelix Tekuthal, Inquiry Dominus The Flood of Mars The Master of Keys Thing in the Ice Thrummingbird Uchbenbak, the Great Mistake Umbris, Fear Manifest Wandering Mind Wharf Infiltrator Wretched Throng
The patterns are of modern design
