Even though most of your testing might come from online, you should still play a bit in paper, as the mechanics and mannerisms are very different
Azcanta, the Sunken Ruin: Solid deck filtering for non-creature spells
(Though now that you've read through this article, hopefully we all realize it's a lot more than that.) It's important to take everything into account and run all the variables we've discussed
PrintMTGs proxy/playtest cards are designed around that in-sleeve consistency idea: standard MTG sizing, familiar feel, and predictable finishing so your deck doesnt end up with one card that behaves like its trying to get caught
But for a guy like me, being able to sell it is life changing
This almost entirely depends on Wan Shi Tongs success in various competitive outlets, like Modern and cEDH, but considering how excited everyone is for the card, it probably wont take long for players to figure things out