At the beginning of each upkeep, put a strife counter on Crescendo of War. Attacking creatures get +1/+0 for each strife counter on Crescendo of War. Blocking creatures you control get +1/+0 for each strife counter on Crescendo of War.
Near Mint - $2.00
Lightly Played - $1.75
Moderately Played - $1.50
Heavily Played - $1.25
Damaged - $1.00
Near Mint Non-English - $2.00
Lightly Played Non-English - $1.75
Moderately Played Non-English - $1.50
Heavily Played Non-English - $1.25
Damaged Non-English - $1.00