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From $21.75
'If you tap a permanent for mana, it produces twice as much of that mana instead.
From $50.75
'Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.
From $62.50
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $215.50
'This artifact doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap this artifact. At the beginning of your draw...
From $126.00
'This artifact doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap this artifact. At the beginning of your draw...
From $166.00
'This artifact doesn't untap during your untap step. At the beginning of your upkeep, you may pay {4}. If you do, untap this artifact. At the beginning of your draw...
From $54.50
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $47.25
'Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.
From $49.25
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $1.50
'If you tap a permanent for mana, it produces twice as much of that mana instead.