Duress is another card that can serve as a good substitute for currently played pricy cards
There are a variety of ways to punish opponents for drawing cards in Magic, and sometimes theres just a good old-fashioned group hug in Commander
Sadly, most of the creatures that do this are legendary already, but Traveling Chocobo, Starfield Vocalist, and Roaming Throne are great options
When you go to drop your own Dockside Extortionist you are either forcing your opponents to sacrifice their Treasure tokens early in response, or they will be giving you a ton of Treasure tokens of your own
The Key lets you slip gigantic cards without trample past chump blockers and the Staff lets you stay untapped to block while simultaneously tapping down opponents blockers
Cards that make duplicate, extra, or double the tokens abound here, so if you can build something to take advantage of that excess while surviving through the turns when your stuff is a bit durdly and slow, you will have a powerful deck that can bide its time and then pop off
