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$23.50 – $29.25
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
$8.00 – $27.00
'{T}: Add {C}.
Metalcraft — {T}: Add {C} for each Urza's land you control. Activate only if you control three or more artifacts.
$0.50 – $1.25
'Whenever a player casts an artifact spell, you may pay {1}. If you do, you gain 1 life.
$1.25 – $1.75
'(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.
$33.75 – $47.50
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
$0.25 – $0.50
'Choose two — • Creatures you don't control get -2/-0 until end of turn. • Create a tapped Powerstone token. • Create a tapped 0/0 colorless Construct artifact creature token...
$21.25 – $27.50
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
$0.75 – $1.75
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.
$15.75 – $20.75
'{T}: Add {C}.
Metalcraft — {T}: Add {C} for each Urza's land you control. Activate only if you control three or more artifacts.
$2.75 – $7.25
'{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.
$24.75 – $45.75
'Gaea's Avenger's power and toughness are each equal to 1 plus the number of artifacts your opponents control.