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 - $2.30
Near Mint Non-English - $2.30
Lightly Played - $2.00
Lightly Played Non-English - $2.00
Played - $1.60
Played Non-English - $1.60
Heavily Played - $1.40
Heavily Played Non-English - $1.40
Damaged - $1.10
Damaged Non-English - $1.10