Mathemagics I like the concept of a card thats simultaneously a 2-mana cycler, a 4-mana draw-2, and a 16-mana wincon
Weve seen Commanders like this before, and in the case of Ob Nixilis, Captive Kingpin, they tend to overly focus on their combo potential

Accelerate Act of Treason Akki Drillmaster Akoum Battlesinger Akroan Crusader Alesha's Vanguard Ambush Party Arc Runner Arcbound Hybrid Arcbound Slasher Avarax Axgard Cavalry Badgermole Balduvian War-Makers Banehound Barging Sergeant Battle Rampart Bellowing Bruiser Bitter Reunion Blackcleave Goblin Blade-Tribe Berserkers Blazethorn Scarecrow Blighted Bat Blitz Automaton Bloodhill Bastion Bloodlust Inciter Bloodthorn Taunter Bloody Betrayal Blur Sliver Boarding Party Bogardan Dragonheart Boiling Earth Boots of Speed Brackwater Elemental Brave the Wilds Brazen Buccaneers Breakneck Berserker Briarblade Adept Burning Sun's Fury Burning-Tree Vandal Burst of Speed Caldaia Strongarm Carnelian Orb of Dragonkind Cartouche of Zeal Cerodon Yearling Chaos Charm Chimney Rabble Chittering Host City of the Daleks Cloak of the Bat Clockwork Percussionist Clout of the Dominus Clutch of Currents Colossal Growth Combat Courier Conduit Goblin Corpulent Corpse Crackling Emergence Crashing Drawbridge Crested Craghorn Crimson Mage Crimson Wisps Crypt Ripper Crystal Slipper Dai Li Indoctrination Dalek Intensive Care Daybreak Combatants Deepcavern Imp Devoted Duelist Dire Wolf Prowler Dissatisfied Customer Disturbed Slumber

The Doctor essentially retires to Trenzalore and lives there for 900 years, fighting off a series of alien invaders (the planet is the last link to Gallifrey, where Time Lords hail from) until hes no longer capable of doing so
These are all judged for printing paper proxies meant to get sleeved alongside a regular Magic card
Playing this in response to a Dockside Extortionist might also change how the remainder of someones turn plays out