Swiftclaw is a first eraNaturecreature with swiftness. It can be switched into a high damage mode in exchange for disabling its swiftness. This makes the creature highly mobile, while giving it situational attack power.
They can trample small units, and are a counter for both of the most ubiquitous M class cards in PvP tier 1: Dreadcharger and Scavenger. All this would add up to a card superior to most everything else in tier 1, if it were not for the price: 80 Power is almost twice as much as most competitive units in tier 1.