It can be, depending on your thought process while playing. If you're indulging in feeling like your willpower can affect what cards get drawn, then yes. If you're just thinking about betting strategy and your opponents, then less so.

My own magical thinking indulgence is fishing. I'll tell myself dumb stuff like "the next cast will be the one". I think any sort of gambling-like experience where random chance is heavily involved can be an outlet for magical thinking, healthy or otherwise.