Scars of Mirrodin block

The Scars of Mirrodin block is the seventeenth Block in Magic history and consists of the large expansion Scars of Mirrodin and the two small expansions Mirrodin Besieged  and New Phyrexia.

Keywords/ability words introduced within this block: Metalcraft, Infect (and poison counters), Proliferate, Battle cry, Living weapon.

Keywords reused from the past: Imprint

The block came out over 2010–2011 and saw a return to the plane of Mirrodin, previously introduced by the set of the same name and the subsequent block.

Watermarks
The block describes the conflict between two major factions - one being Mirrodin, and the other being the invading forces of Phyrexia. Cards aligned with these two factions are watermarked. The ratio of Phyrexian to Mirran cards significantly changes in favor of Phyrexia with the procession of the sets.