Psychic Allergy

Psychic Allergy is a Commander card through and through — the multiplayer table is where draining each opponent every upkeep compounds fast enough to matter, especially in a color-dense meta where blue, black, or green permanents are everywhere. In a 1-vs-1 Legacy or Vintage context it's a five-mana enchantment that ticks an opponent down by a handful of life per turn cycle, which is far too slow against decks that win by turn three or four. Oathbreaker runs 20 life totals, so the drain accelerates toward relevance, but the format's speed still works against a do-nothing-on-entry permanent. Psychic Allergy is niche even in Commander — it earns its slot in life-drain or enchantress builds targeting a specific dominant color at the table, not as a generically good card.