Growing your guy and giving it flying AND drawing a card
Chart shows the price of Eri #210 at the end of each month going back as long as we have tracked the item.
Press the Enemy serves as a removal spell with a twist
Because these cards arent at an especially high power level I expect the regular Magic Online offerings to eschew the mechanic entirely, and if you do want to incorporate dungeons into one of your Cubes I recommend going heavy on the mechanic so that players have good odds of actually completing one

A Display of My Dark Power Abundant Countryside Apple of Eden, Isu Relic Azula, Cunning Usurper Barbflare Gremlin Benthic Explorers Black Cat, Cunning Thief Black Widow, Super Spy Blightwing Bandit Bloodsoaked Insight Cactus Preserve Cavern of Souls Chaos Moon Contamination Court of Locthwain Cruelclaw's Heist Cunning Rhetoric Damping Sphere Dead Man's Chest Deep Water Dictate of Karametra Dire Fleet Daredevil Dream-Thief's Bandana Eclipsed Realms Eloren Wilds Extraplanar Lens Eye of Ojer Taq Fellwar Stone Firdoch Core Gandalf, Westward Voyager Gonti, Canny Acquisitor Gonti, Lord of Luxury Gonti, Night Minister Harvest Mage Heartbeat of Spring Heartless Conscription Horizon of Progress Hostage Taker Ian Malcolm, Chaotician Incubation Druid Infernal Darkness Juxtapose Keeper of Progenitus Kinnan, Bonder Prodigy Klaw, Master of Sound Laughing Jasper Flint Lavaleaper Lidless Gaze Mana Flare Mana Web Menagerie Curator Mirari's Wake Mirri Mnemonic Betrayal Naga Vitalist Naked Singularity Nikya of the Old Ways Nita, Forum Conciliator North Star Omni-Changeling Outrageous Robbery Overabundance Pale Moon Patchwork Banner Path of Ancestry Petty Larceny Pillar of Origins Planar Nexus Plaza of Harmony Progenitor's Icon Pulse of Llanowar

The Teferi Play Bundle no longer incorrectly shows +10 Mastery Levels for the locked item after purchasing