You get to draw two cards, play an Artifact for free, copy one of your permanents, spread three +1/+1 counters over your creatures, and destroy one of your opponents cards
While this mechanic appears only on creatures, if a non-creature permanent becomes a creature and gains it, that creature will still return to the battlefield with the counter, even if that counter is meaningless in its non-creature state
The commons and uncommons in a specific Set Booster are connected, telling little stories about the families of New Capenna
If you can fetch it up from your library and make this a consistent thing, then you can literally take over a game
Gods will know, that many of the Liches in existence spend their time in binders or cases
To my mind, Commander is at its best when youre playing extravagant, high-mana spells, and Thryx facilitates that