Zilortha, Strength Incarnate

Combat's oldest arithmetic says a creature dies when it takes damage equal to its toughness. This static ability rewrites that arithmetic for your entire side of the board: your creatures survive until they take damage equal to their power instead. That single substitution flips the glass-cannon calculus. A 7/3 is normally a liability, a body that trades down to almost any blocker, but here that same creature has to absorb seven combat damage before it falls, and its power doubles as both its threat and its new survival number. High-power, low-toughness beaters become the ideal followers, because everything that made them fragile now makes them tough. The phrasing covers every creature you control, which includes the printed 7/3 on the card face; it needs seven damage to die rather than three, so it is exactly as durable as the aggressors it enables. What makes this a genuine design curiosity is where it intervenes: not a keyword, not a triggered payoff, not a toughness buff, but an edit to the definition of lethal damage in the combat rules themselves. The reach is precise, though. It only touches damage-based death. Destroy effects, exile, sacrifice, and toughness-reduction still kill your creatures on their own terms, so the ability reshapes combat math and burn math without pretending to be protection from everything else.