The first five experience counter generators were: Daxos the Returned Ezuri, Claw of Progress Kalemne, Disciple of Iroas Meren of Clan Nel Toth Mizzix of the Izmagnus Experience counters would return on a single card in Commander 2020 , Kelsien, the Plague, and again two years later in Commander Legends: Battle for Baldurs Gate on Minthara, Merciless Soul
For example, I see a lot of Five Color Commander decks that run a lot of sweeping removal and indestructible dorks for defense and survival that dont run this
Murktide Regent is just a big dumb flying creature, but its really good at being big, dumb, and flying
Examples include Staff of Eden, Vault's Key, Arvinox, the Mind Flail, Nihiloor, Thieving Amalgam, and The Horus Heresy