Fumigate

Wrath of God and Day of Judgment answer the widest board and the emptiest one at the same price, and the answer costs you the same either way: four mana for a hard reset, no consolation for the tempo you burn getting there. The lifegain rider on this five-mana version changes the calculus. The more the board has spiraled, the more you claw back: a stalled standoff with eight bodies on the table refunds eight life, which is often the difference between resetting from a position of weakness and resetting from one you can defend. That tilts the math on when to fire it. A traditional sweeper is best cast when you are behind and need to survive; this one wants the board at its widest, because the payoff scales with the carnage. The catch is that the gain counts every creature destroyed, your own included, so a control deck holding back blockers and a go-wide deck overextending into it both feed the same life total. That symmetry keeps it from being a pure punish-the-aggressor button; it rewards patience instead, quietly buying back the tempo a five-mana sorcery costs you and turning the most-feared sequencing decision in fair white decks (when do I wrath?) into one with a built-in incentive to wait.