At the beginning of your upkeep, put a +1/+1 counter on each creature you control if you control a creature with power 5 or greater. Then you gain 10 life if you control a creature with power 10 or greater. Then you win the game if you control a creature with power 20 or greater.
Near Mint - $3.30
Lightly Played - $3.00
Played - $2.30
Heavily Played - $2.00
Damaged - $1.70
Near Mint Non-English - $3.30
Lightly Played Non-English - $3.00
Played Non-English - $2.30
Heavily Played Non-English - $2.00
Damaged Non-English - $1.70