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From $17.75
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
From $0.75
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.
From $0.50
'Whenever a player casts an artifact spell, you may pay {1}. If you do, you gain 1 life.
From $16.75
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
From $0.75
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
From $20.00
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
From $2.50
'{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.
From $0.75
'(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.
From $41.25
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
From $18.25
'As this artifact enters, choose a creature type.
Creature spells of the chosen type cost {2} less to cast.
From $0.75
'(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Exile all nonland permanents that aren't legendary.