Rouse

The interesting wrinkle here is the alternate cost, not the pump. An early-era cycle of black instants let a Swamp-controller swap the mana payment for two life, and this is the combat-trick member: a +2/+0 boost you can fire off for free as long as your manabase cooperates. The design logic is a bet on tempo over resources. In a creature race, two life is cheap and mana is the scarce currency, so paying with the life total lets you hold up a counterattack swing or an ambush kill without committing a single untapped land. The Swamp clause is what limits the discount: it only exists for a board with a Swamp, which prices the alt-cost into the same color identity that wants the aggressive combat math in the first place. Strip the Swamp away and it reverts to a plain two-mana trick, which is the floor the card is balanced against. It is a modest effect, the kind of common that rounds out a black aggressive shell rather than headlining one, but the life-as-resource template it sits inside is the part worth noting: a deliberate experiment in letting players spend the one resource that does not tap, when the board state makes mana the bottleneck.