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From $8.75
{T}: Add {W}.
{T}: Add {R}. Activate only if you control a Mountain or a Plains.
From $16.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
From $0.25
'This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {R} or {G}.
$0.25
'{T}: Add {C}.
{1}, {T}, Sacrifice this land: Search your library for a basic Swamp, Mountain, or Forest card, put it onto the battlefield tapped, then shuffle.
From $6.50
({T}: Add {B} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.
From $0.25
'{T}: Add {C}.
{1}, {T}, Sacrifice this land: Search your library for a basic Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
From $0.25
'This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {R} or {G}.
From $5.75
This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {U}.
{U}, {T}: The next spell you cast this turn can't be countered.
$0.25
When this land enters, sacrifice it. When you do, search your library for a basic Swamp, Mountain, or Forest card, put it onto the battlefield tapped, then shuffle and you...
From $7.25
'This land enters tapped unless you control a Mountain. {T}: Add {R}. {R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains...
From $0.25
'As this land enters, you may reveal a Mountain or Plains card from your hand. If you don't, this land enters tapped.
{T}: Add {R} or {W}.
From $0.25
'This land enters tapped unless you control a Mountain or a Plains.
{T}: Add {R} or {W}.