A Killer Among Us Adaptive Automaton An Unexpected Party An-Zerrin Ruins And They Shall Know No Fear Arachne, Psionic Weaver Arcane Adaptation Ashes of the Fallen Banner of Kinship Barbarian Guides Belbe's Portal Black Market Connections Blood Oath Bloodline Bidding Bloodline Pretender Bloodline Shaman Brass Herald Caller of the Hunt Callous Oppressor Cavern of Souls Celestial Reunion Chronicle of Victory Circle of Solace Coalition Flag Collective Inferno Conspiracy Coordinated Barrage Cover of Darkness Crippling Fear Deification Distant Melody Doom Cannon Door of Destinies Elvish Soultiller Engineered Plague Etchings of the Chosen Fertile Imagination For the Ancestors From the Rubble Gathering Stone Gauntlets of Chaos Giant Slug Harmonized Crescendo Haunting Voyage Herald's Horn Icon of Ancestry Illusionary Presence Imagecrafter Instruments of War Juxtapose Kindred Boon Kindred Charge Kindred Discovery Kindred Dominance Kindred Summons Leyline of Transformation Lifecraft Engine Littjara Luminescent Rain March from Velis Vel Metallic Mimic Mirror Entity Avatar Mirror of the Forebears Mistform Mutant Mistform Wakecaster Molten Echoes Morophon, the Boundless Obelisk of Urd Oko, Shadowmoor Scion Orcrist, Goblin-cleaver Outbreak

Called the pity timer, every time you dont get a wildcard of any rarity when opening a pack, the drop rates for that rarity will increase
You can lean into this with a lifegain commander like Ayli, Eternal Pilgrim, Sorin of House Markov, or Karlov of the Ghost Council, and you can amplify your opponents life loss with effects like Wound Reflection and Warlock Class
As long as your deck runs heavy on draw and discard, you fill your graveyard up with expensive spells (or cheap ones simply by casting them), then once this big boy hits the battlefield, you can start reigning terror on your opponents by casting those big spells from beyond the grave for free
You get to play with some very powerful and cheap cards when you build around them