Disney Lorcana: Rise of the Floodborn , a new booster set
With so many long games even simply taking a card away from the high end of the mana curve could be quite effective
It's not often that a card doubles as a win condition and a mana generator, but Revel in Riches fits the bill quite well
Ezuri +1/+1 Counters Ezuri, Claw of Progress | Illustration by Livia Prima Commander (1) Planeswalkers (2) Nissa, Voice of Zendikar Jiang Yanggu, Wildcrafter Creatures (30) Elvish Mystic Fyndhorn Elves Llanowar Elves Blighted Agent Cankerbloom Coiling Oracle Devoted Druid Gyre Sage Incubation Druid Invisible Stalker Quirion Beastcaller Sage of Hours Thrummingbird Champion of Lambholt Cold-Eyed Selkie Edric, Spymaster of Trest Evolution Sage Kami of Whispered Hopes Managorger Hydra Marwyn, the Nurturer Rishkar, Peema Renegade Tuskguard Captain Vorel of the Hull Clade Fathom Mage Forgotten Ancient Lulu, Stern Guardian Siren Stormtamer Master Biomancer Cultivator of Blades Mycoloth Instants (12) Bioshift Silkguard Slip Out the Back Tamiyo's Safekeeping Counterspell Experimental Augury Growth Spiral Negate Reality Shift Serum Snare Inspiring Call Steady Progress Sorceries (7) Thirsting Roots Contentious Plan Nature's Lore Rampant Growth Unnatural Restoration Cultivate Tezzeret's Gambit Enchantments (9) Hardened Scales Kenrith's Transformation Awakening Zone Bred for the Hunt Garruk's Uprising Jugan Defends the Temple Levitation Primal Empathy Wizard Class Artifacts (2) Contagion Clasp Swiftfoot Boots Lands (37) Ash Barrens Brokers Hideout Evolving Wilds Forest x14 Hinterland Harbor Island x9 Karn's Bastion Lumbering Falls Mosswort Bridge Oran-Rief, the Vastwood Simic Growth Chamber Tangled Islet Tanglepool Bridge Temple of Mystery Thornwood Falls Yavimaya Coast Ezuri, Claw of Progress is a deck that takes a little time to get going, but quickly snowballs out of control
Even outside of Standard, Vivi Ornitier is great in Commander as well, both in the 99 and as a commander itself with cEDH playability
Once it transforms into Jace, Telepath Unbound, you can defend via the +2, or get card advantage with the -3
