Verazol is the only creature in Magic with that evocative text, enters the battlefield with a +1/+1 counter on it for each mana spent to cast it. Commander tax is mana spent to cast it
Which leads me to my first idea for a set, a shifted color pie
Jund Food 4 Bloodtithe Harvester 4 Blightstep Pathway 4 Cauldron Familiar 4 Fatal Push 4 Deadly Dispute 4 Fable of the Mirror-Breaker 4 Mayhem Devil 4 Blood Crypt 4 Witch's Oven 3 Scavenger's Talent 3 Blackcleave Cliffs 3 Ygra, Eater of All 2 Sulfurous Springs 2 Overgrown Tomb 2 Claim the Firstborn 2 Swamp 2 Unlucky Witness 1 Mountain 1 Stomping Ground 1 Hive of the Eye Tyrant 1 Cragcrown Pathway 1 Ramunap Ruins 4 Thoughtseize 2 The Meathook Massacre 2 Unlicensed Hearse 2 Leyline of the Void 2 Ob Nixilis, the Adversary 1 Ashiok, Dream Render 1 Damping Sphere 1 Jegantha, the Wellspring Jund Food is basically a traditional Rakdos Sacrifice deck that uses Treasures and several green lands to splash Bloomburrow 's Ygra, Eater of All
The Last Ride is strongest the closer you are to death, and being able to roll it out from your Command zone to hit an opponent for big numbers is the kind of chaos were here for
You can also abuse blink or reanimation loops to bring your Commander in repeatedly, thus drawing a ton of legends in a single turn
Yidris, Maelstrom Wielder Yidris, Maelstrom Wielder is all about turning your spells into an unstoppable cascade of value