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From $0.25
'As this land enters, you may reveal a Swamp or Mountain card from your hand. If you don't, this land enters tapped.
{T}: Add {B} or {R}.
From $2.25
'This land enters tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.
From $18.50
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.
From $2.25
'This land enters tapped unless you control a Mountain or a Plains.
{T}: Add {R} or {W}.
From $0.75
'Haste
As long as this card is in your graveyard and you control a Mountain, creatures you control have haste.
From $90.00
'You may sacrifice two Mountains rather than pay this spell's mana cost.
Fireblast deals 4 damage to any target.
$0.25
This land enters tapped unless you control a Mountain or a Forest.
{T}: Add {R} or {G}.
From $15.25
'{T}, Pay 1 life, Sacrifice this land: Search your library for a Mountain or Forest card, put it onto the battlefield, then shuffle.
$0.25
'Enchant creature
Enchanted creature has mountainwalk. (It can't be blocked as long as defending player controls a Mountain.)
From $0.25
'This creature gets +2/+0 for each Mountain you control. Whenever you attack with creatures with total power 12 or greater for the first time each turn, untap all attacking creatures....
From $42.00
'{T}, Pay 1 life, Sacrifice this land: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.