The floor on Mystic Confluence is drawing three cardsessentially a Jace's Ingenuitywhile the ceiling is a three-for-one when you can Mana Leak an important spell, bounce one of your opponent's creatures (or even your own Snapcaster Mage), and draw a card along the way for good measure
Its even a decent win condition, and Ive personally seen players be absolutely blindsided by this for upwards of 25 life
Im a big fan of one card being able to do multiple things, and removal that hits more than one target is always top of my list
Unfortunately the ability can only be activated on your turn, but with the aggressive leanings of this commander I think you want to be going for the acorns anyway
If you want to lean in on tokens, Anointed Procession, Mondrak, Glory Dominus, and Ojer Taq, Deepest Foundation are all fair game
Avatar: The Last Airbender also has its own textless cards in Collector Boosters