Marisi, Breaker of the Coil is that commander
While new sets will often create new archetypes in Standard, the new cards can still impact larger formats by enhancing already powerful decks or invigorating less successful strategies
As you mutate creatures on top of one another, you will generate a ton of value by creating creature tokens, summoning creatures for free, tapping down your opponent's creatures, fetching lands, bouncing opposing creatures, etc
Thirst is perfect except that you need a far too high artifact count for it to be good
TCGplayer records that Phlage's price has almost halved since the ban on the 18th
Plus, it can pump your entire dragon team with a simple mana sink ability, making combat even scarier