War Horn

An anthem that only fires on the swing, which is a narrower promise than the static team-buffs it sits next to. Glorious Anthem and its kin pump your board the moment they resolve, defense included; this artifact pays out solely in the combat step, and solely on the attackers. That restriction is the entire pitch: it is colorless, so any aggressive deck can run it regardless of what it pours into its creatures, and it never improves a blocker on the turn you sit back. The math is plain in the way old common-and-uncommon anthems were plain: every creature you send in hits one harder, so the wider your attack, the larger the swing in total damage, and a card that costs the same whether you field two attackers or seven scales with your width rather than your individual creatures. Go-wide aggro has reached for low-rarity team-pump like this in every era, and this is the artifact answer to the question of how a deck without a color identity asks its small bodies to close. Nothing flashy lives here, but the design is honest about what it sells: offense, on the swing, for any color.