Nonartifact spells you cast have improvise. (Your artifacts can help cast those spells. Each artifact you tap after you're done activating mana abilities pays for {1}.)
"In the early days, Urza's wondrous automatons were seen as symbols of hope and courage."
—*The Antiquities War*
Near Mint - $0.95
Lightly Played - $0.90
Moderately Played - $0.76
Heavily Played - $0.57
Damaged - $0.47
Near Mint Non-English - $0.95
Lightly Played Non-English - $0.90
Moderately Played Non-English - $0.76
Heavily Played Non-English - $0.57
Damaged Non-English - $0.47
Foil Prices
Near Mint Foil - $1.75
Lightly Played Foil - $1.50
Moderately Played Foil - $1.25
Heavily Played Foil - $1.00
Damaged Foil - $1.00
Near Mint Foil Non-English - $1.75
Lightly Played Foil Non-English - $1.50
Moderately Played Foil Non-English - $1.25
Heavily Played Foil Non-English - $1.00
Damaged Foil Non-English - $1.00