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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 $1.00
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
From $21.75
'If you tap a permanent for mana, it produces twice as much of that mana instead.
From $1.50
'If you tap a permanent for mana, it produces twice as much of that mana instead.
From $65.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.
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 $3.50
'Counter target spell unless its controller pays {1}.
From $49.00
'{T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the...
From $17.25
'{T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a Dragon creature spell. {2}, {T}, Sacrifice this land: Return target Dragon creature card...