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From $0.50
'This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
From $0.75
'This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
From $1.25
'This land enters tapped unless you control a Swamp. {T}: Add {B}. {B}, {T}: Target creature you control connives X, where X is the number of creatures that died this...
From $12.50
'({T}: Add {B}.)
From $1.75
'This land enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.
From $28.75
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.