whats an emblem? (Scars of Mirrodin question)

[Stamina]

whats this "emblem" these guys are talking about, never heard the term before

Koth of the Hammer
-5 You get an emblem with Mountains you control have T: This land deals 1 damage to target creature or player

Venser, the Sojourner
-8 You get an emblem with Whenever you cast a spell, exile target permanent

[Arix]

An emblem is just a "thing" that grants you the ability specified. It lives in the command zone (the same zone that Planes, Schemes, and EDH generals live in), and nothing can interact with it. Emblems have no characteristic other than the ability specified - they have no name, type, colour, or anything else.