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$0.25
'Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional one mana of any color.
From $9.00
'({T}: Add {B} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $3.00
'Each opponent sacrifices a creature or planeswalker with the greatest mana value among creatures and planeswalkers they control.
From $5.25
'Whenever a creature dies, put a charge counter on this enchantment.
At the beginning of your first main phase, add {B} for each charge counter on this enchantment.
From $0.25
'Enchant land
Whenever enchanted land is tapped for mana, its controller adds an additional two mana in any combination of colors.
From $11.75
'If an opponent cast three or more spells this turn, you may pay {0} rather than pay this spell's mana cost.
Exile any number of target spells.
From $0.75
Lands you control have "{T}: Add one mana of any color."
{T}: Add one mana of any color.
From $1.50
'As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped.
{T}: Add {U} or {R}.
From $6.00
'This spell can't be countered.
Destroy target nonland permanent with mana value 3 or less.
From $59.00
'Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one...
From $0.25
'{T}: Add {C}. ({C} represents colorless mana.)
{T}, Pay 1 life: Add one mana of any color. Spend this mana only to cast a spell with devoid.