At the beginning of your upkeep, put a +1/+1 counter on Myr Prototype. Myr Prototype can't attack or block unless you pay {1} for each +1/+1 counter on it.
Near Mint - $300
Lightly Played - $300
Moderately Played - $200
Heavily Played - $200
Damaged - $200
Near Mint Spanish - $300
Lightly Played Spanish - $300
Moderately Played Spanish - $200
Heavily Played Spanish - $200
Damaged Spanish - $200
Foil Prices
Near Mint Foil - $600
Lightly Played Foil - $500
Moderately Played Foil - $400
Heavily Played Foil - $400
Damaged Foil - $300
Near Mint Foil Spanish - $600
Lightly Played Foil Spanish - $500
Moderately Played Foil Spanish - $400
Heavily Played Foil Spanish - $400
Damaged Foil Spanish - $300