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 - $1,700
Lightly Played - $1,400
Moderately Played - $1,200
Heavily Played - $1,100
Damaged - $900
Near Mint Spanish - $1,700
Lightly Played Spanish - $1,400
Moderately Played Spanish - $1,200
Heavily Played Spanish - $1,100
Damaged Spanish - $900