"The October 2013 Standard arena rotation is now online. On the first Monday of each month, we will be cycling the Standard arena pool. Rather than only having access to the same standard arenas day in and day out, each month we will now feature 25 arenas selected as playable for Standard-level matches.
Newly released arenas will remain exclusive for at least three months, but every other arena is eligible to be included in the cycle."
Start date: October 7, 2013
End date: November 4, 2013
Duel
TDM
CTF
Aerowalk
Beyond Reality
Base Siege
Cobalt Station
Demon Keep
Double Impact
Dredwerkz
Evolution
Eviscerated
Foolish Legacy
Furious Heights
Hell's Gate Redux
Japanese Castles
Repent
Siberia
Silence
Sorrow
Space Chamber
Spider Crossings
Spillway
Stronghold
Terminus
Tornado
Vertical Vengeance
Window Pain
Links:
Official announcement