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
The pump effect of both cards is certainly good, and the deck could use another three-drop or two
Azcanta, the Sunken Ruin: Solid deck filtering for non-creature spells
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
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