Thankfully, theres a heckin good vehicle to use to stop those shenanigans and I dont mean Unlicensed Hearse, which yes, you should probably be playing too
Since many of these sources are repeatable rather than one-time, and with Shadowheart in the command zone, I believe this is a reasonable amount
Mind's Desire (2008) Mind's Desire is one of the more gorgeous cards on the list for today
2 Phyrexian Fleshgorger If youve ever wanted to put a massive amount of pressure on your opponent just try casing a full-sized Phyrexian Fleshgorger
Youll probably target yourself each time, but theres nothing stopping you from targeting two opponents on any given activation
It wont have any preconstructed Commander decks like you might expect, but the cards in the Scene Box shown above wont be Standard-legal, and are instead designed with Commander in mind