What it does
Psychic Stimulus isn't a standard Magic keyword or ability—it doesn't appear in the comprehensive rules or on any official card, so there's nothing concrete to explain about how it functions in a game.
If you encountered this on Mythicwyrm, it may be a custom or homebrew mechanic specific to that platform, a misremembered name, or a fan-made card. Common things people confuse it with include effects that draw cards, "ping" creatures, or trigger off instant/sorcery casts (like prowess or magecraft).
To give you an accurate rundown, I'd need the actual card or rules text. If you can share where you saw it or quote the reminder text, I can break down what it does, the nuance to watch for, and how it plays out in a Commander pod.
Iconic cards with Psychic Stimulus
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