I was curious if there is something equivalent to AlphaGo but for MTG.

From the little I have seen they are different beasts (hidden information, number and complexity of rules...).

PS: Does this count as nerdsniping?

I'm not aware of any good ML models for MTG. I'm just using off-the-shelf LLMs with a custom harness. It'd certainly be possible to do RLHF or something using the harness I've built, but it'd be expensive - anybody want to give me a few million dollars of OpenRouter credits so I can give it a shot?