Spirit of Resistance

Assemble one permanent of each color and you simply cannot be dealt damage: not reduced, not redirected, but prevented entirely, for as long as the condition holds. The whole design lives in that condition. A three-mana enchantment reading "you cannot lose to damage" would rank among the strongest cards ever printed; the demand for one permanent of every color is the toll that makes it sit still. You need a board diverse enough to satisfy the WUBRG requirement and resilient enough to keep satisfying it, because the instant an opponent strips a color (or you simply lack one) the wall comes down and damage starts getting through again. That fragility is the point: the prevention is a switch wired to your weakest permanent, and any deck running it inherits a deckbuilding problem (find a fifth color, then keep every color represented) far larger than the card itself. This is greed-as-cost design, a five-color domain payoff deliberately oversized to justify the setup it demands. The card reads as an oddity now precisely because the years since have priced damage-prevention far more cautiously; very little printed afterward turns off an entire axis of the game for a single setup condition, however demanding that condition is to maintain.