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From $1.00
'Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
From $23.75
'Instant and sorcery spells you cast cost {1} less to cast.
Whenever you cast an instant or sorcery spell, draw a card.
From $21.25
'If you tap a permanent for mana, it produces twice as much of that mana instead.
From $1.25
'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 $24.75
'At the beginning of your upkeep, you draw a card and you lose 1 life.
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 $26.50
'Vivid — {T}: For each color among permanents you control, add one mana of that color.
From $2.75
'Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.