High Alert

Toughness has always been the defensive stat, the number that keeps a creature alive rather than the number that ends the game. This enchantment inverts that relationship wholesale: your creatures deal combat damage from their back number, so a wall's worth of toughness becomes a weapon, and the fatter something is, the harder it hits. That single line reframes an entire class of bodies that were built to sit still (high-toughness blockers, the 0/x and 1/x defensive shells that white and blue keep printing for board stability) into a working offense. The second clause removes the obvious obstacle by letting those defenders attack at all, and the untap ability closes the loop: a creature that assigns damage by toughness can swing, be untapped, and still block on the crackback without ever caring about its power. What makes the card an archetype-definer rather than a role-player is that none of the three abilities does much in isolation. Toughness-as-power is inert if your defenders cannot swing; letting defenders attack is inert if they have no attack power; the untap is a fair-rate utility spell attached to neither. Stapled onto one enchantment, the three pieces demand a deck built around them, which is why the payoff comes from creatures with lopsided stats and static toughness-boosters rather than from any single beater. It asks you to abandon the usual attacker math entirely and count the wrong number.