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*
NM-Mint Foil - $660.00
Lightly Played Foil - $627.00
Moderately Played Foil - $594.00
Heavily Played Foil - $528.00
Damaged Foil - $429.00
NM-Mint Foil Non English - $660.00
Lightly Played Foil Non English - $627.00
Moderately Played Foil Non English - $594.00
Heavily Played Foil Non English - $528.00
Damaged Foil Non English - $429.00