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From $2.00
'If you tap a permanent for mana, it produces twice as much of that mana instead.
From $1.50
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
From $25.50
'At the beginning of your upkeep, you draw a card and you lose 1 life.
From $3.50
'Counter target spell unless its controller pays {1}.
From $10.50
'Whenever a land an opponent controls is tapped for mana, tap all lands that player controls that could produce any type of mana that land could produce.
From $38.75
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
From $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 $1.25
'Choose a card name. Reveal cards from the top of your library until you reveal a card with that name, then put that card into your hand. Exile all other...
From $19.25
'White spells you cast cost {1} less to cast.
Blue spells you cast cost {1} less to cast.
Spells your opponents cast cost {1} more to cast.