You can unlock it by playing any matched game on the Avatar battlefield, and clicking on the Cabbage Merchant's card until it explodes
Get a chance to crack a fresh Demonic Tutor from an in-print set
Swap them for four copies of cards you wanted to see more often
That adds some insurance policy to your more aggressive plays as those looking to swing with characters will need to get past Baloo, Von Bruinwald XIII first, and those looking to sweep the board with big and dangerous songs like Grab Your Swords and Be Prepared will risk pushing the game in your favour, or even handing you the win
I also really like Walking Atlas and Scaretiller as backups to Patron for putting lands back onto the battlefield after being bounced with Moonfolk or other effects
Whenever one or more nonland cards are milled, put a +1/+1 counter on each of up to X target creatures, where X is the number of nonland cards milled this way