Unless I'm mistaken, Markov Baron is the only card with both madness and convoke, so when your mana is tapped out and you're faced with a Mind Rot or need to crack a blood token, three creatures can save this baron, it's sweet
How to Build a Commander Deck in MTG Full Guide
Its a notorious combo piece in cEDH and Modern alike, acting as the linchpin of the bloodpod strategy (often tutoring for cards like Kiki-Jiki, Mirror Breaker)
They then sacrifice all of their unchosen nonland permanents simultaneously
Anyone in the process of figuring out how to play Magic: The Gathering, should prioritize putting this card in their deck
But if youre playing with a choose a background commander creature and have a background card as a second commander, the background acts just like a partner commander would