What it does
I'm not able to explain "Psychic Defense" because it isn't an actual Magic: The Gathering keyword or ability. It may be a misremembered name, a card from another game, or something invented.
If you're thinking of a real mechanic, a few possibilities come to mind: Ward (an enchant-like protective ability that taxes opponents to target your permanent), Hexproof or Shroud (preventing targeting), or Protection (the "DEBT" rules: can't be Damaged, Enchanted/Equipped, Blocked, or Targeted by the relevant quality).
Let me know the exact card or the effect you're trying to understand, and I'll give you a precise, Commander-focused breakdown including the rules nuances and how it plays out in multiplayer games.
Iconic cards with Psychic Defense
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