Sigil of Valor

The "attacks alone" trigger inverts the usual go-wide math. Most token payoffs ask the whole team to swing and spread the buff across bodies; this one demands the opposite, parking the board at home so the equipped creature can absorb the entire count in a single strike. Five other creatures means a +5/+5 swing for a two-mana artifact and a one-mana equip, and that scaling comes entirely from the part of the board the buff deliberately leaves behind. The condition is strict rather than gradual: send even one extra attacker and the trigger simply does not fire, so there is no partial payoff, only the binary choice between a lone swing at full value and a wide swing at none. That makes it a closer for a deck that has already flooded the battlefield and wants to convert raw creature count into one oversized attacker, not a piece that participates in an alpha strike. Note too that the bonus is pure stats, with no evasion or trample attached, so a defender with a single blocker can chump the whole haymaker away; the equip has to be paired with a body that can already get through or an opponent who cannot afford to trade. The cheap equip cost lets you re-suit a fresh creature after removal, but the axis never changes: hold the swarm back, send one, and let the absence of the rest do the damage.