It should make Unown DAMAGE the default deck for Expanded, the benchmark that determines whether a deck can compete in the format
As a one-printing mythic with a relatively unique (at least for unbanned cards) effect, it wouldn't be a surprise to see the new price stick
The win condition seems to be Library of Alexandria
As a 5-color commander, Azlask's color identity lets you include every single one of the other experience counter cards, and its generally useful activated ability synergizes well with all those extra ways to generate counters
Having it on a stick is greatif you dont need to sweep out the weenies, it can still swing, block, and sacrifice to deal an extra 2 to finish off a creature damaged by something else (perhaps from combat)
Generating a huge amount of card draw along with an eventual boost to mana production and recursion, Tamiyo truly stands out in an era of MTG that has been less focused on Planeswalkers as a whole