While reprints are expected as soon as July, and should continue for a while given the Final Fantasy expansion is part of MTGs standard set of cards (and thus legal in all tournament play), the difficulty of not only finding cards at the moment, but actually being able to afford them, has been a bit of a buzzkill.
This is the best way to hunt down the rarest Avatar x MTG cards, if you got the cash to flash
With the effect only reducing your first dragon spell per turn by 2 colorless mana as long as your commander is on the battlefield, it's still useful to run this green enchantment as your background
Often you see Birgi at the helm of a Mono-Red Storm or spells matter Commander since you generate mana each time you cast a spell
If you were to make a token, you also get that many 1/1 Squirrel creature tokens to go along with it
Ad Nauseam is disliked for its ability to combo with cards like Phyrexian Unlife and Teferi's Protection, providing you infinite card draw