Serra's Blessing

Vigilance was a young keyword when this enchantment shipped, and the design idea is the anthem-as-static-grant: instead of stapling the ability to one body, the card paints it across your whole board for two mana. That collapses a defensive tax the game otherwise charges every combat step, the choice between attacking and holding back blockers. Under this enchantment that choice evaporates, and what it rewrites is the race math of a wide board: you commit to the swing without surrendering the next turn's defense. The cost is that it grants nothing across an empty battlefield and scales only with how many attackers you field, which is what keeps a board-wide keyword grant fair at this rate. It asks nothing of tribe or color identity beyond the white you pay, so it slots into any go-wide build that wants its attackers to keep guarding the door. The template of board-wide vigilance runs through later cards that hand out the keyword wholesale; this enchantment is one of the earliest clean statements of it, a permanent that quietly changes how every combat step resolves for as long as it stays on the table.