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$17.00 – $21.25
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
$2.75 – $7.25
'{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.
$15.75 – $21.50
'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.
$2.00 – $5.25
'{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.
$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}:...
$5.50 – $7.25
'Flash Flying You may cast colorless spells and artifact spells as though they had flash. Whenever you cast a spell, if the amount of mana spent to cast that spell...
$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 – $2.50
'Target player mills four cards. Conspire (As you cast this spell, you may tap two untapped creatures you control that share a color with it. When you do, copy it...