4 Muxus, Goblin Grandee While Muxus does cost a whopping 6 mana, he really is worth it

All-Out Assault Angrath, the Flame-Chained Anje Falkenrath Beledros Witherbloom Betor, Kin to All Black Carriage Bontu's Last Reckoning Cecil, Dark Knight Cinderhaze Wretch Coffin Queen Cyclonus, Cybertronian Fighter Dance of the Dead Dee Kay, Finder of the Lost Dihada, Binder of Wills Dread Wight Eater of the Dead Edea, Possessed Sorceress Esper Sojourners Fain, the Broker Frightshroud Courier Geyadrone Dihada Grimgrin, Corpse-Born Haunted Hellride Helldozer House Guildmage In the Darkness Bind Them Ivorytusk Fortress Karrthus, Tyrant of Jund Mana Leech Mana Skimmer Melancholy Merieke Ri Berit Merrow Bonegnawer Merrow Grimeblotter Mole Worms Mutinous Massacre Necro-Impotence Nissa of Shadowed Boughs Norritt Paralyze Phyrexian Arena Phyrexian Gremlins Ready // Willing Sauron, the Lidless Eye Scrib Nibblers Shakedown Heavy Slave of Bolas Spinal Embrace Tergrid's Lantern The Beast, Deathless Prince The Nipton Lottery The Wretched Trystan's Command Tyvar, Jubilant Brawler

Everyone simultaneously opens a 12-card booster pack, selects a card from it, and adds it to their pool
Add Rubblehulk for more hilarity
Explore the House with Paranormal Frame Cards Things found within the House have a strange quality about them
Also, there's Orochi Soul-Reaver , a 5/4 Snake Ninja Rogue that can be ninjutsued in for 4 instead of its normal 6 mana and provides a very good combat damage trigger for both commanders: Whenever one or more creatures you control deal combat damage to a player, you create a treasure token and manifest the top card of that player's library