Loxi: Yeah this is sick, if anything I think the colors might have been a way to taper the balance of this a bit - I don't think it would have been too strong since it still enters tapped, but it makes this a bit more of a fun niche card
and if you focus on equipment, you can make good use of the mana cost reduction ability of 'Raging Battle Mouse'

The Dungeons Baldur's Gate Wilderness Dungeon of the Mad Mage Lost Mine of Phandelver Tomb of Annihilation Undercity Venture Cards Acererak the Archlich Bar the Gate Clattering Skeletons Delver's Torch Displacer Beast Dungeon Descent Dungeon Map Eccentric Apprentice Ellywick Tumblestrum Fates' Reversal Fifty Feet of Rope Find the Path Fly Immovable Rod Intrepid Outlander Keen-Eared Sentry Kick in the Door Midnight Pathlighter Nadaar, Selfless Paladin Planar Ally Precipitous Drop Radiant Solar Ranger's Hawk Secret Door Sefris of the Hidden Ways Shortcut Seeker Thorough Investigation Triumphant Adventurer Varis, Silverymoon Ranger Veteran Dungeoneer Wandering Troubadour You Find a Cursed Idol Yuan-Ti Fang-Blade Yuan-Ti Malison Zalto, Fire Giant Duke Zombie Ogre Payoff Cards Acererak the Archlich Barrowin of Clan Undurr Cloister Gargoyle Eccentric Apprentice Ellywick Tumblestrum Gloom Stalker Nadaar, Selfless Paladin Precipitous Drop We should also probably mention Dungeon Delver and Hama Pashar, Ruin Seeker

Undying is not the same as regenerating
This document is written while the rules and card text changes are still going through editing, so it's possible they'll be a little different from the final changes
True to its name, it largely sees the player tidying up their hand and board state before passing to the next player