Jeskas Will As far as cards designed specifically for Commander go, Jeska's Will is up there

Oloro, Ageless Ascetic Lifegain Oloro, Ageless Ascetic | Illustration by Eric Deschamps Commander (1) Planeswalker (1) Creature (20) Archivist of Oghma Aven Mindcensor Ayli, Eternal Pilgrim Blood Artist Crested Sunmare Dark Confidant Dauthi Voidwalker Drannith Magistrate Elesh Norn, Grand Cenobite Esper Sentinel Grand Abolisher Grand Arbiter Augustin IV Kambal, Consul of Allocation Kunoros, Hound of Athreos Ledger Shredder Linvala, Keeper of Silence Opposition Agent Serra Ascendant Venser, Shaper Savant Vito, Thorn of the Dusk Rose Instant (15) Ad Nauseam Beacon of Immortality Counterspell Cyclonic Rift Dovin's Veto Enlightened Tutor Force of Negation Force of Will Mana Drain Mystical Tutor Reality Shift Swords to Plowshares Teferi's Protection Trickbind Vampiric Tutor Sorcery (8) Damn Demonic Tutor Exsanguinate Farewell Grim Tutor Toxic Deluge Vindicate Windfall Enchantment (13) Authority of the Consuls Black Market Connections Blind Obedience Bloodchief Ascension Celestial Mantle Darksteel Mutation Exquisite Blood Necropotence Rhystic Study Sanguine Bond Smothering Tithe The Meathook Massacre Wound Reflection Artifact (9) Aetherflux Reservoir Alhammarret's Archive Arcane Signet Bolas's Citadel Chrome Mox Mana Vault Sol Ring Uba Mask Well of Lost Dreams Land (33) Ancient Tomb Arid Mesa Bloodstained Mire Bojuka Bog Cabal Coffers City of Brass Command Tower Exotic Orchard Fabled Passage Flooded Strand Gemstone Caverns Godless Shrine Hall of Heliod's Generosity Hallowed Fountain Island x2 Marsh Flats Misty Rainforest Plains x3 Polluted Delta Prismatic Vista Reliquary Tower Scalding Tarn Strip Mine Swamp x2 Urborg, Tomb of Yawgmoth Urza's Saga Verdant Catacombs Watery Grave Windswept Heath Ive always been a fan of turtle-y cozy Commander decks, and no card does it better than Oloro, Ageless Ascetic

(Check with your local game store for how to participate with in-store Murders at Karlov Manor events.) Plus, as alluded to elsewhere (and a tip for sleuths out there), the Murders at Karlov Manor Bundle is a product that also contains clues for one of the 13 puzzles in the RavnicaDetectiveAgency.com event
Mew is many fans' favorite Mythical, and undeniably it has starred on some of the TCG's most iconic cards
The last condition is perhaps the easiest
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Whenever a player casts their second spell each turn, proliferate