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$21.25 – $27.50
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
$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.
$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.
$33.75 – $47.50
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
$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.
$23.50 – $29.25
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
$24.75 – $45.75
'Gaea's Avenger's power and toughness are each equal to 1 plus the number of artifacts your opponents control.
$3.00 – $6.75
'You win the game if you control a land of each basic land type and a creature of each color.
$22.75 – $25.25
When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control." Tap an untapped artifact you control: Add {U}. {5}:...
$2.00 – $5.25
'{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.