You can also pay mana to use the proliferate mechanic that Bloated Contaminator has above
This deck looks incredibly fun, and there are a lot of options in how you want to build it
At its most broken, the Baron Von Count deck is probably an Ad Nauseam Storm combo deck a la Maralen of the Mornsong, where one player will die as a result of the Counts ability, and the rest will fall to Grapeshot or Tendrils of Agony (none of which is particularly problematic for me, by the way)
Each room as you journey through Undercity has nice effects for various Commander battlefield states, and the final room is going to be awesome for most Commander decks that play a reasonable number of creatures
Best MTG Lost Caverns of Ixalan cards Ojer Axonil, Deepest Might/Temple of Power The Ancient One Quintorius Kand Bloodletter of Aclazotz Chupacabra Echo The Skullspore Nexus Bonehoard Dracosaur Squirming Emergence Echoing Deeps Matzalantli, the Great Door/The Core There are a lot of really intriguing cards in the latest Magic: The Gathering set, including a set of gods who transform into land cards when theyre defeated