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From $68.75
'({U/P} can be paid with either {U} or 2 life.)
Counter target spell with mana value 1.
From $3.25
'{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast a spell that shares a watermark with this land.
From $50.50
'{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 $12.25
'({T}: Add {B} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $2.75
'Whenever a player taps a land for mana, this enchantment deals 1 damage to that player.
From $54.50
'If this card is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on...
From $37.50
'Vivid — {T}: For each color among permanents you control, add one mana of that color.
From $6.75
'You don't lose unspent green mana as steps and phases end.
Omnath gets +1/+1 for each unspent green mana you have.
From $10.25
'{T}: Add {B}. Channel — {3}{B}, Discard this card: Mill three cards, then return a creature or planeswalker card from your graveyard to your hand. This ability costs {1} less...
From $6.00
'This land enters with three mining counters on it. {T}, Remove a mining counter from this land: Add one mana of any color. If there are no mining counters on...
From $1.00
'Flash
Flying
When this creature enters, counter target spell. Put X +1/+1 counters on this creature, where X is that spell's mana value.
From $11.00
'Flash (You may cast this spell any time you could cast an instant.) Flying Whenever this creature attacks, target instant or sorcery card in your graveyard gains flashback until end...