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From $2.25
'This creature gets +1/+1 as long as you control a Mountain.
This creature gets +1/+1 as long as you control a Plains.
From $53.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.
From $12.75
{T}: Add {W}.
{T}: Add {R}. Activate only if you control a Mountain or a Plains.
From $0.25
'Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.
From $1.25
'This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {R} or {G}.
From $0.25
'Enchant Mountain you control
When this Aura enters, exile target creature an opponent controls until this Aura leaves the battlefield. (That creature returns under its owner's control.)
From $6.75
'This land enters tapped unless you control a Mountain or a Plains.
{T}: Add {R} or {W}.
From $0.25
'This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {R} or {G}.
From $15.75
{T}: Add {R}.
{T}: Add {U}. Activate only if you control an Island or a Mountain.