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From $51.50
'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 $0.50
'Counter target spell. If you control a Wizard, add an amount of {C} equal to the amount of mana spent to cast that spell at the beginning of your next...
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 $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 $48.75
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $2.00
'If you tap a permanent for mana, it produces twice as much of that mana instead.