Light of Sanction

Prevention effects key off both the creature taking the damage and the source dealing it, and this enchantment weaponizes that overlap one direction: your creatures still take aim from your own effects, but the damage is simply voided. The intended trick is to pair it with a symmetrical sweeper that pings every creature in play, so your side shrugs off the damage while the opponent's board melts. The same logic covers pingers and any source that would normally divide its damage across friend and foe; the friendly half is simply voided. It converts effects designed to be fair into effects that only hurt the other side, and it does so without touching opposing creatures at all, which keeps it clean against most disruption. The narrowness is real: it does nothing against an empty board, nothing against opposing removal, and nothing until you have a damage source of your own pointed somewhere productive. But it anchors a recognizable white build-around lineage, the "make my own damage one-sided" piece that asks the deck to supply the burn and trusts the prevention to handle the collateral. Read it as a permission slip rather than a payoff: it is the card you assemble around, not the one that wins on its own.