They are making Battle Cry a mechanic in Mirrodin Besieged:
Battle Cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn)
Interestingly enough this is the inverse of what Battle Cry essentially does.
Posted By:
tcollins
(1/18/2011 6:05:46 PM)
Try Roar of the Kha.
Posted By:
mrredhatter
(10/26/2009 9:59:42 AM)
Yes, Roar of the Kha or my personal favorite for all-untappers, To Arms!
Posted By:
Weretarrasque
(2/13/2010 9:35:12 AM)