These are the engines, packages, and mechanical identities that shape how a deck actually plays
When they do, you draw two cards and put a quest counter on Yes Man

Activated Sleeper Adaptive Sporesinger Akki Scrapchomper Alabaster Host Intercessor Alabaster Host Sanctifier Ambulatory Edifice Annex Sentry Apostle of Invasion Archfiend of the Dross Argentum Masticore Armored Scrapgorger Aron, Benalia's Ruin Ascendant Evincar Atmosphere Surgeon Atraxa's Skitterfang Atraxa, Grand Unifier Atraxa, Grand Unifier Atraxa, Praetors' Voice Attentive Skywarden Axiom Engraver Ayara, Furnace Queen Balduvian Atrocity Basilica Shepherd Battlefly Swarm Belbe, Corrupted Observer Benalish Sleeper Bilious Skulldweller Blackcleave Goblin Blade Splicer Bladed Ambassador Bladegraft Aspirant Blight Mamba Blight Pile Blight Titan Blightbelly Rat Blighted Agent Blightsower Thallid Blightsteel Colossus Blightwidow Blind Zealot Blinding Souleater Blistergrub Bloated Contaminator Bloated Processor Body Snatcher Bone Shredder Bonepicker Skirge Branchblight Stalker Brimaz, Blight of Oreskos Brudiclad, Telchor Engineer Brutalizer Exarch Burnished Dunestomper Cacophony Scamp Cankerbloom Capricious Hellraiser Carnifex Demon Cathedral Membrane Caustic Hound Cephalopod Sentry Chained Throatseeker Chancellor of the Annex Chancellor of the Dross Chancellor of the Forge Chancellor of the Spires Chancellor of the Tangle Charforger Chimney Rabble Chittering Skitterling Chrome Host Hulk Chrome Host Seedshark Chrome Prowler Cinderslash Ravager

II Target nontoken creature becomes a 6/6 legendary Horror creature named Fenric and loses all abilities
I like Zero for the pure unfettered power level and Lands, of course
Four is a lot of mana in Modern, especially for a 23-land deck