Instant, 1R (2)
Common
Add {R} to your mana pool for each creature you control.
"A church is just wood and walls. A congregation is the faithful praising the angels."
—Kolman, elder of Gatstaf
Illus. Nils Hamm

5/1/2012: Battle Hymn uses the stack and can be responded to. The amount of mana you add to your mana pool is based on the number of creatures you control when Battle Hymn resolves.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern