@HungryGuy Well, no, on many points. Allow me to parse out your answer.
1) There is no evidence that the universe is an “artificial construct.” This would imply that the universe is not natural and constructed by a being. This is also known as creationism.
2) Quantum mechanics, which includes the double slit experiment and quantum entanglement, describes the physics of quantum (meaning really small) objects. Not big objects like Tarot cards. Small objects like electrons. The largest object that quantum effects have been observed I believe is a C60 buckyball (but I’m not sure on this last point).
3) Relativity is the physics of gravity, how objects behave in gravity, and the effects of moving at high speeds. Again, nothing to do with Tarot cards. Nothing weird about it, actually if you understand the math.
4) “Doesn’t obey what we would call rational rules.” By whose definition? Yours? The orbit of Mercury was not considered rational until it was completely explained by relativity. There are certainly observed effects we don’t understand and are not yet explained, such as dark matter, but that’s the role of science and scientists.
5) “Some thoughtful people are starting to wonder if the universe isn’t some vast virtual simulation”. Who? I wonder if you’re thinking of the holographic universe theory which is an obscure extremely complicated mathematical theory that is derived from superstring theory, M-theory, and quantum gravity and was derived and proposed by theoretical physicist Leonard Susskind. But again, nothing to do with Tarot cards.
6) “And if so, why couldn’t that underlying software engine recognize patterns of matter (such as that of Tarot cards) and manipulate them for whatever purpose?” This doesn’t even make any sense. That’s all I’m going to say about that.